Exsum geolingk


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Exsum geolingk

  1. 1. EXECUTIVE SUMMARY LAND USE DIRECTION BASED ON ENVIRONMENTAL GEOLOGY ASPECTS IN NGADIRGO, WONOLOPO AND WONOPLUMBON SUBDISTRICT Created To Fulfill Environmental Geology Subject Task (TKP 250) Lecture : Ir. Hadi Nugroho Dipl. EGS, MT By : Group IA Renny Desiana 21040112130051 Dwitantri Rezkiandini 21040112130071 Aulia Adhiyajna F. 21040112130089 Ferdianta Wahyu N. Pratama 21040112130097 Oktaviana Rahayu J.A. 21040112130099 Yosephine Purba 21040112140041 Fajar Hadhiyanto Wibowo 21040112140125 DEPARTMENT OF URBAN AND REGIONAL PLANNING FACULTY OF ENGINEERING DIPONEGORO UNIVERSITY SEMARANG 2013
  2. 2. ii TABLE OF CONTENTS TABLE OF CONTENTS ……………………………………………………………….. ii TABLE LISTS ……………………………………………………………….. iii CHAPTER I INTRODUCTION ……………………………………………………………….. 1 1.1 Background ……………………………………………………………….. 1 1.2 Issues ……………………………………………………………….. 2 1.3 Goals and Purposes ……………………………………………………………….. 2 1.3.1 The Purposes ……………………………………………………………….. 2 1.3.2 Target ……………………………………………………………….. 2 1.4 Scope ……………………………………………………………….. 3 1.4.1 Regional Scope ……………………………………………………………….. 3 1.4.2 Scope of Content ……………………………………………………………….. 3 1.5 Methodology ……………………………………………………………….. 3 1.5.1Data Collection Methods ……………………………………………………………….. 3 1.5.2 Analysis Methods ……………………………………………………………….. 4 CHAPTER II DISCUSSION ……………………………………………………………….. 5 2.1 Regional’s Characteristic ……………………………………………………………….. 5 2.1.1 Geographical Location ……………………………………………………………….. 5 2.1.2 Physically Characteristic ……………………………………………………………….. 5 CHAPTER III CONCLUSION ……………………………………………………………….. 18
  3. 3. iii TABLE LISTS Table II.1 SWOT Analysis Ngadirgo Village, Wonolopo and Wonoplumbon ……………………………………………………… 11 Table II.2 Slope Analysis Ngadirgo Village, Wonolopo and Wonoplumbon ……………………………………………………… 12 Table II.3 Analysis of Rainfall Village Ngadirgo, Wonolopo, and Wonoplumbon ……………………………………………………… 12 Table II.4 Analysis of Slope Village Ngadirgo, Wonolopo, and Wonoplumbon ……………………………………………………… 13 Table II.5 SWOT Analysis Ngadirgo Village, Wonolopo, and Wonoplumbon ……………………………………………………… 14
  4. 4. 1 CHAPTER I INTRODUCTION 1.1 Background Environmental Geology is essentially a science of applied geology in an effort aimed at utilizing natural resources and energy efficiently and effectively to meet the needs of human life in the present and the future by reducing the environmental impact caused as much as possible (Iqbal, 2011). Meanwhile, according to Hrasna (2002), states that with respect to the original definition of the environment, the Environmental Geology can be defined as part of the lithosphere, which directly affects the condition of the existence and development of society, people who exploit and which converts the environment. From the above statements, it can be concluded that Environmental Geology is a science which to study the relationship between aspects of geology, natural resources, and human being. This relationship takes part in solving the problems of land use, minimize disasters that may occur due to human activities, and maximizing the potential of existing resources in a region. Environmental Geology Science has nine aspects of geology consisting of morphology, topography, lithology, geological structure, stratigraphy, hydrology, climatology, hydrogeology, and geologic hazards. These aspects will provide an important information for planning the world. The real benefit of the geological aspects is as a guide in determining aspects of land use of an area. By considerations of this geology aspects, land use mapping of an area is expected can be optimal, and can reduce the environmental impact that could arise in the future. Based on the descriptions above and seeing the physical circumstances in District Mijen, so it will need a further assessment of the function of land use in the District Mijen, particularly in sub-villages which serve as study area that is Ngadirgo Village, Village Wonolopo, and Wonoplumbon Village. Green open space area is dominating several villages in the district Mijen. One of the problems that can be studied further is the conversion of green open space into residential areas. Many residential areas were built in the green open space that are not really suitable to be conversed as it is. 1
  5. 5. 2 With a more depth and detailed assessment to the sub-urban villages in the study area, is expected to provide a major contribution to the development in those sub-urban villages. Assessment which based on the environment al geology aspects would make a future planning will be done more sustainable so that all kinds of geological hazards that may arise in the future will be minimized. 1.2 Issues The problems which being the main focus of this paper is on the direction of land use in accordance with aspects of environmental geology in the Ngadirgo Village, Wonolopo Village, and Wonoplumbon Village so that development can be done more attention to environmental aspects and to minimize hazards that could occur in the future. This problem can be analyzed through analysis of land suitability analysis is based on referrals and Spatial Planning (Spatial) as determined by the relevant government, the Regional Planning Board of Semarang. The land suitability identification of study area based on the potential and constraints of the geological aspects found in the field, namely morphology, topography, lithology, geological structure, strartigrafi, hydrology, climatology, hydrogeology, and geologic hazards. 1.3 Goals and Purposes 1.3.1 The Purposes The purpose of making this paper is to analyze and identify the physical condition of Ngadirgo Village, Wonolopo Village, and Wonoplumbon village in the Mijen district so as to provide a proper land use guidance which appropriate land use analysis and land suitability function of the area in accordance with the geological aspects. 1.3.2 Target 1. Analyze the study area borders and the state of the study area in general. 2. Analyze the study area issues which are related to environment al geology aspects. 3. Identify environmental geology aspects in the study area including morphology, topography, lithology, geological structure, stratigraphy, hydrology, climatology, hydrogeology, and geologic hazards. 4. Assess the area function of the study area. 5. Analyzing potential and constraints in the study area according to their natural condition.
  6. 6. 3 6. Provide recommendations based on the function of the area, the potential and constraints in the study area. 1.4 Scope 1.4.1 Regional Scope The scope are Ngadirgo Village, Wonolopo Village, and Wonoplumbon Village. These villages are part of the Mijen district. Ngadirgo Village broad is 10.01km2 , Wonolopo Village broad is 2.21 km2 , and Wonoplumbon Village broad is 6.80 km2 . These three villages have administrative boundaries, namely: - North : District Ngaliyan - South : Village Jatisari - West : Kendal - East : Village Pesantren 1.4.2 Scope of Content The material discussed in this paper is the physical state of Ngadirgo Village, Wonolopo Village, and Wonoplumbon Village, District Mijen, Semarang based on geological aspects, namely: - Morphology - Topography - Lithology - Geological Structure - Stratigraphy - Hydrology - Climatology - Hydrogeology - Geological Hazards 1.5 Methodology In the discussion and preparation of this paper using two methods, namely: 1.5.1 Data Collection Methods Data that required in the preparation of this paper is the primary data and secondary data.
  7. 7. 4 - Primary Data Primary data is data which collected directly by the researcher of the respondents, not derived from data collection has ever done before. Primary data collection techniques can be done through questionnaire, interviews, focus group discussions, and observations. - Secondary Data Secondary data is data that has been collected by someone else and not prepared for the preparation of the paper, but can be used for data collection purposes. 1.5.2 Analysis Methods The analysis method consisted of quantitative analysis and qualitative analysis. - Quantitative Analysis Method This analysis used an analytical tool in numeric form, namely scoring factor that serves to determine the function of the area based on existing scores. The variables included in the scoring factors are topography, climatology, and lithology. - Qualitative Analysis Method This analysis is used to analyze the data in the form of non-numeric or data that can not be translated in the form of numeric variable. Variabel that using qualitative analysis methods, namely structural geology, stratigraphy, hydrology, climatology, hydrogeology, geological hazards and land use. analysis tools can be: a. Descriptive analysis, the data processing is done by giving a description of the study area. b. Normative analysis is used to analyze the study area using the provisions or regulations. c. SWOT Analysis, is a method used to determine and analyze Strength, Weakness, Opportunity, and Threat.
  8. 8. 5 CHAPTER II DISCUSSION 2.1 Regional’s Characteristic 2.1.1 Geographical Location The total area of Ngadirgo, Wonolopo and Wonoplumbon village is 19.02 km2 with administrative boundaries, namely: - North : District Ngaliyan - South : Jatisari Village - West : Kendal Regency - East : Pesantren Village 2.1.2 Physically Characteristic a. Morphology The morphologic type of Wonolopo, Ngadirgo and Wonoplumbon Village composed of rather flat, wavy and hilly. With the landscape form is structural ramp hill with denudational process. Geomorphic units namely hills geomorphic with the slopes ranging from 2 -15% and has a height of 30-500 asl. This area is suitable for agriculture and plantations, but the areas that have been denunationed has a disadvantage, it is the binder composition of rocks and soil is not compact, so it will be susceptible to weathering, erosion and landslides. b. Topography Wonolopo, Ngadirgo and Wonoplumbon Village have topography level with a slope which is divided into five sections, namely: - Flat areas with slope 0-8% found in the eastern part of the Ngadirgo Village. This location is suitable to utilize as an area settlements. - Sloping areas with slopes level of 8-15% is located in almost parts of the village. Region with a slope level of 8 -15% is cultivated area, that could be used for a wide range of human activities depend on the physical conditions. Generally, this area is used for residential, farm and moor - A rather steep region with slopes level of 15-25% is located in almost of the Wonoplumbon village, and several western parts of Ngadirgo and Wonolopo village. This region is utilized as production forests and plantations, this are is 5
  9. 9. 6 a useful buffer to place water flows and also maintains the characteristics’ of protected areas. There are also settlements in some regions, this location is not true at all, because it will be vulnerable to avalanches even just for a small frequency. - A rather steep Region with slopes levels 25-40% located in the south of Wonoplumbon village. This area can be used as buffer zones or protected area, but in Wonoplumbon Village, it used for the buffer zone. This region relatively close to the river that used by citizens for garden, this area is very prone to soil erosion in the river cliff. - Areas with very steep slopes > 40% there is little area in the southern part of the Wonoplumbon village. This area is suitable as a protected and buffer area. But at the Wonoplumbon Village can only be used as regions of the plantations, forests and agriculture. - c. Lithological There are 2 types of rocks in the Ngadirgo, Wonolopo and Wonoplumbon Village, both rock types are: a) Basic Sedimentary Rocks One type of this rock is sandstone, which is found in the northern part of the Ngadirgo and Wonoplumbon village. Some kinds of these rocks are sedimentation of clay, silt rocks, sand rocks. Characteristics of these rocks is not having a strong tie between the rocks matix, so it does not fit established buildings, especially the clay rocks in Blorong River in Wonoplumbon is highly unstable. b) Volcanic Rock Breccia These rocks are located throughout Wonolopo Village, and the southern part Wonoplumbon and Ngadirgo Village. These rocks has spread most widely in Ngadirgo Village, Wonolopo Village, and Wonoplumbon village. There are 2 types of soil are scattered in the Village Ngadirgo, Wonolopo Village, and Village Wonoplumbon. The second type of soil it is: a) Latosols Reddish Brown This type of land scattered throughout the entire territory Village Wonoplumbon and Ngadirgo and most areas of the Wonolopo Village. Latosols
  10. 10. 7 reddish brown is the most dominant soil types in the Village Ngadirgo, Wonolopo Village, and Wonoplumbon Village. b) Latosols Brown Distribution of soil types is not too broad. Latosols brown soil types found at the Village tenggar Ngadirgo. The soil fertility ranged from moderate to low, but the land latosols have a high level of soil productivity due to a soil that is loose. In the village Ngadirgo, Wonolopo and Wonoplumbon most of the lands used for plantations, moor and forest. For use as paddy fields, latosols soil can be utilized optimally when its location was around the river banks. latosols is good enough in retaining water and erosion and good enough to get up in the building there on, except large-scale manufacturing because in the dry season the soil is very susceptible to evaporation that causing less solid constituent elements of the matrix and causing landslides. d. Geological Structures Geological structures contained in the Village Ngadirgo, Wonolopo and Wonoplumbon according to spatial maps and Geology Map sheet Semarang- Magelang is a geological fault structure. The fault lines transverse section headed southwest to the north village Wonoplumbon and turn to the west and south Ngadirgo and Wonoplumbon village. In the existing situation, can not find the original formation of the fault, but the fault indication can be identified in the river cliffs which resulted in a sharper bend in the river. Geological structures that can be found in the geological structure Wonoplumbon are stout on the rocks in the border river silt Blorong. On the fault lines in the west to the east village Ngadirgo, not so according to established buildings, regardless of the possibility of shifting earth or landslides, but more due to this fault line has a fairly steep slope level with the middle ground motion. But the fault lines in the southern village Wonoplumbon still be sought to build residential buildings such as the condition of relatively flat terrain with the type of ground motion is very low. However, the point of the construction site should be far from the border river Blorong to minimize the occurrence of
  11. 11. 8 landslide hazards by the brunt of the river flow is sufficient. For ground movement, is divided into three, namely: - Very Low Movement, located on the slopes of <15% are in almost Wolopo, Ngadirgo and Wonoplumbon areas. - Low Movement, situated in 15% - 25% area that is in a minority in Wolopo, Ngadirgo and Wonoplumbon village. - Middle Movement, located on the slope ramps 8-15% to the steep 25-40% spread Nagdrgo, Wonolopo and Wonoplumbon. - e. Stratigraphy Formations that are found are Kaligetas Formation with the main rock constituent is breccia, tuffaceous sandstone and clay rocks. Clay rocks and breccia rocks can be found east of the river Blorong or around the river banks. In addition, there is also a rock formations Winch that form intercalation in the village Wonoplumbon limestone rock breccia and conglomerate rock. Because most of the stratigraphy in the Village Ngadirgo, Wonolopo and Wonoplumbon consists of breccia and sandstone rocks, the building was set up especially for large buildings should be done more in the assessment. f. Hidrology Surface water flow in the Village Ngadirgo, Wonolopo, and Wonoplumbon can be seen on the river Blorong and Plumbon River. Blorong river flows along the village Wonoplumbon with total length of the river is 93 km. Blorong river water discharge in the dry season as much as 4.053 m3 /second, while the rainy season is as much as 7,686 m3 /second. Watershed Blorong much more profusely and have a fairly wide river length of about 3-5 meters. This condition is very good to be used as agricultural areas that use irrigation water from the river to the state of the farm remains in the wet conditions. Unlike the Blorong river, stream Plumbon quieter so that in this region there exist any river settlement, discharge water does not pose a hazard as erosion or landslides.
  12. 12. 9 g. Climatological Climatological conditions in the Wonoplumbon, Wonolopo and Ngadirgo village roughly equal to the entire state of climatology Mijen District. Have a total average rainfall per year from 27.7 to 34.8 mm. With temperatures average minimum measured in Semarang Climatology Station varies from 21.1 ° C in January to 24.6 ° C in May, and the average maximum temperature varies from 29.9 ° C to 32.9 ° C. Monthly wind speed based on the average of Semarang BMKG station varies from 215 km / day in August to 286 km / day in January. This condition is very suitable for the cultivation of crops because the plants will get enough water supply from rain water. Moreover, with a high amount of rainfall will also still be able to optimize the utilization of wet farming. h. Hydrogeological Wonolopo, Ngadirgo, and Wonoplumbon village have hydrogeologic characteristics local aquifers and productive. Middle productivity of aquifers are found in all regions throughout the Village Ngadirgo Wonoplumbon, and most of the village Wonolopo with water discharge of more than 10 liters / sec and has a good water quality. Discharge water is good enough for the water used by residents as a water resource of residential areas. To get water, digging wells to a depth of 10-15 meters. In addition, the productivity of the aquifer are very suitable to utilize wetlands for agriculture and also for the plantation. Meanwhile, there is a local aquifer productivity at a fraction Village Wonolopo. The condition means that the groundwater reserves in the Village Wonolopo somewhat not so abundant in some parts. This condition is not suitable for agricultural use by utilizing ground water, but rather used as irrigated agriculture by utilizing the river and also take advantage of high rainfall. i. Geological Hazards Problems found in the Village District Mijen especially Wonoplumbon, Wonolopo and Ngadirgo is ground motion. However, the ground movement are relatively rare because the district Mijen generally are at low ground motion zone. In addition, other geological hazards is related denudasional process that resulted in rock weathering. This is due to weathering of soils and rocks do not have a
  13. 13. 10 holding capacity soil / rock solid or have high levels of compaction between the low matrix. This will lead to erosion and landslide geological hazards, especially on steep slopes. j. Land Use Aspects of land use contained in the Village Ngadirgo, Wonolopo and Wonoplumbon consists of five types of land uses. Among them are permanent production forest areas, plantation areas, farming, moor and settlements. Production forest spread in every village, but in the area large enough to be in the Village Wonoplumbon. Where in this village, the trees are planted in production forest is a tree that can produce products, such as rubber tree rubber used by citizens to be sold and used by residents teak wood for sale. For this type of land use as plantations, widely used by residents to plant some trees that do not have a big hard rod, such as for planting some vegetables such as peppers and tomatoes, for cassava planting trees and some trees such as betel vine and others. Where to watering this plantations, residents take advantage of the river flow and flow Blorong Plumbon river which flows through the three villages. Similarly, land use as plantations, pa da agricultural land that is widely available in the Village Ngadirgo and Wonolopo also use the river, the river flow Plumbon. So that kind of rice fields in two villages there is more directed at the irrigated water supply does not depend on the intensity of rainfall. Many types of plants grown by the residents is rice. Which is a very suitable time to plant rice during the rainy season is due to the amount of water to irrigate rice fields abound. Land use is not much different from the dry land farming, but the land is planted tree species more diverse. Surrounding communities utilize the dry land to plant moringa trees, tree roots like galangal, turmeric and all kinds of tubers. While land use settlements scattered in every village, but a large number of extents present in Wonolopo Village. A large number of settlements in the affected villages in this district because there Mijen district government offices, there Mijen markets were trading centers in the District Mijen and there are also several other facilities, such as banking. In the existing situation in the Village Ngadirgo, Wonolopo and Wonoplu mbon also found that land use spatial violate the rules. Such as the transfer function of land that had a teak tree plantation cleared for peanuts.
  14. 14. 11 Another problem is the people's houses in the buffer zone that should not be used as a residential area. k. Potential and Constraints Table II.1 SWOT Analysis Ngadirgo Village, Wonolopo and Wonoplumbon Internal Eksternal STRENGTH 1. Soil types Latosol who has a pretty good level of fertility 2. There is a fairly heavy Blorongwatershed flow 3. Prodektif aquifers are High rainfall Cultivated area is fairly dominate WEAKNESS 1. Ground motion is less stable in some places 2. Holding capacity is less solid ground 3. Steep slope ramps level Prone to landslides and bank erosion. OPPORTUNITIES 1. Regulations on land use clear 2. Improved technology in the future 3. Increased investment or investment 1. To do an agriculture-based activities such as gardening, farming. This is done in order to increase the rate of the general economy Mijen district. 2. Settlement can be made on the basis tetapa cultivated area with state government regulations and environmental conditions. 1. Establishing a partnership between the government and the private sector to understand and comprehend the physical condition of a region that is done the Development tertruktur and still consider the physical condition of the environment. 2. Development is done by calculating the details of cultural influences - such as the dangers posed by utilizing appropriate technology. THREAT 1. Any land use that violates the rules of spatial 2. The transformation of the area around a watershed 3. The total population will be growing 1. With increasing population, the need for housing will increase, determining the location of the designated residential areas is necessary, to conform to aspects of land use has been determined by the spatial and also according to the physical condition of the area to be used as the settlement. In order to minimize the danger that came in later. 1. Not doing destruction of vegetation around the Sar river to prevent erosion on river banks. And also so that watersheds can be maintained existence. 2. Development is done should pay attention to minimizing the environmental aspects of geological hazards that may occur. Source: Group Analysis, 2013 From the SWOT table above it can be concluded that the Village Ngadirgo, Wonolopo and soil type latosols Wonoplumbon reddish brown and has a high density of river water and continuous so that it can be used for plantation and agriculture, while the relatively flat terrain can be utilized as a residential development of the area. But there is also a river in the River bank erosion along the Village Wonoplumbon Blorong, it happens because of river bank erosion by water flowing from the top of a cliff or by the brunt of the strong flow of the river bend in the river, so the area is located near the banks of the river is very
  15. 15. 12 dangerous if used as a settlement. Kelurahan Ngadirgo, Wonoplumbon, and Wonolopo ground motion zone are at medium to very low is not so worrying, because the circumstances existing at the sub-village could not be found or identified the danger of a very large ground motion effects. l. Scoring Analysis Spatial analysis of the carrying capacity of this land is a consideration that is used to determine the appropriate land use patterns for micro areas in the northern part of the village Ngadirgo, the southern side Wonolopo, Wonoplumbon western part and the eastern part of the village Ngadirgo. This analysis will provide information about the suitability of land suitable for the region. To determine the function of a local area we use analysis tool analyzes the scoring. Scoring is based on analysis of the topographic slope aspect, namely the intensity of the rainfall climatology on average, and the type of soil lithology. Benchmark used for scoring analysis based on criteria derived from the table Ministerial Decree No.837/KTPS/UM/II/1980 and No.683/KPTS/UM/VII/1981. a) Slope Analysis Slope analysis can be performed based on the table below: Table II.2 Slope Analysis Ngadirgo Village, Wonolopo and Wonoplumbon No. Class Slope (%) Description Score 1 I 0-8 Flat 20 2 II 8-15 Ramps 40 3 III 15-25 Kinda Steep 60 4 IV 25-45 Steep 80 5 V >45 Very Steep 100 Sources: Ministerial Decree No.. 837/UM/II/1980 and No.683/KPTS/UM/1981 b) Rainfall Analysis Analysis of the magnitude of rainfall intensity can be done based on the table below; very steep Table II.3 Analysis of Rainfall Village Ngadirgo, Wonolopo, and Wonoplumbon No. Class Interval (mm/day) Description Score 1 I 0-13,6/<1500-2000 Very Low 10 2 II 13,6-20,7/2000-2500 Low 20 3 III 20,7-27,7/2500-3000 Medium 30 4 IV 27,7-34,8/3000-3500 High 40 5 V >34,8/>3500 Very High 50 Sources: Ministerial Decree No.. 837/UM/II/1980 and No.683/KPTS/UM/1981
  16. 16. 13 c) Soil Type Analysis Lithological types of soil analysis can be done based on the table below; Table II.4 Analysis of Slope Village Ngadirgo, Wonolopo, and Wonoplumbon No Class Type Description Score 1 I lluvial, Gley soil, Planosol, Hidromorf Gray, Laterite Soil Water Sensitive 15 2 II Latosol Less Sensitive 30 3 III Brown forest, Non Caltic Brown, Mediterania Sensitive 45 4 IV Andesol, Latrik, Grumosol Sensitive 60 5 V Regosol, Litosol, Organol, Renzina Very Sensitive 75 Sources: Ministerial Decree No.. 837/UM/II/1980 and No. 683/KPTS/UM/1981 Based on the results of the scoring are made it is known the result of the carrying capacity of the land area of the Village Micro Ngadirgo, Wonolopo, Wonoplumbon can be concluded that in urban areas Ngadirgo, Wonolopo and Wonoplumbon functions can be grouped into two areas, namely the function of cultivated area and the function of the buffer zone. In the cultivated area can be utilized for residential areas, plantation, dry land. Whereas in the buffer zone can not be used as a residential area in the buffer zone is the area between cultivated areas and protected areas, and therefore in the buffer zone functioned for planting more trees and can not didirakan homes in the region.
  17. 17. 14 Table II.5 SWOT Analysis Ngadirgo Village, Wonolopo, and Wonoplumbon Slope Category Score Rainfall Score Soil Type Score Total Score Function Area Location 0-2% 20 27,7-34,8 mm3 /hari 40 Latosol 30 90 Cultivation Ngadirgo Village 2-15% 40 110 Cultivation 15-25% 60 130 Buffer 2-15% 40 27,7-34,8 mm3 /hari 40 Latosol 30 110 Cultivation Wonolopo Village 15-25% 60 130 Buffer 2-15% 40 27,7-34,8 mm3 /hari 40 Latosol 30 110 Cultivation Wonoplumbon Village 15-25% 60 130 Buffer 25-40% 80 150 Buffer >40% 100 170 Buffer
  18. 18. 15 d) Land Suitability Analysis Based on the analysis of the spatial aspects of rainfall, soil type and slope in the scoring analysis, and also based on the Spatial Plan, it will get the land suitability analysis of the Village Ngadirgo, Wonolopo and Wonoplumbon form of cultivated area and the buffer zone. Cultivated area in the Village Ngadirgo, Wonolopo and Wonoplumbon a function of the area's most dominating. This corresponds to a state of relatively flat terrain to sloping, ie sekitr 0-8% and 8- 15%. In accordance with the nature and characteristics of the slope ramps that do not have the high ground motion, so its presence does not threaten anything that was on it. While based on level terrain, cultivation area is also caused due to the condition of the land in this district is latosols ground. Latosols land is land which is very supportive for use in all aspects of life, because soil formation latosols compact, unlike clay which would be unstable because of the influence of hydrology and weather around it, making it very dangerous to something that is on it. Latosols land is suitable for use as a plantation, agriculture, permanent production forests and settlements. As for the buffer zone is more prevalent in the village Wonoplumbon. This happens because kelerangan in this village is relatively steep with reddish brown landfills latosols nutrient rich, so that the region is more suitable to be developed as a plantation forest and land management that does not require so large. This buffer serves to awake tetapa characteristic protected areas. In the existing circumstances, there are some areas that occurred over the function. Buffer zone which should only be used as a forest with no human intervention in the portion of a lot, but in the Village Wonoplumbon some experience cutting teak forest area for conversion to plantation residents, such as corn and peanuts. Another problem is also the settlements that should be in the region but is cultivated in the buffer zone. Direction of the new land use that can be compiled in this report include the direction of agricultural land use, land-use residential referrals and referral procedures for trafficking. 1. Referrals Land Use Settlements Direction of new settlements on land use over and put on Wonoplumbon Village in the Village Ngadirgo the number is not so
  19. 19. 16 great. Determination Wonoplumbon village settlements in the region considering the physical aspect, such as aspects of environmental geology, aspect and the aspect of the river where the road infrastructure. Determination of the area of new residential land use in the Village this Wonoplumbon sought to be placed in areas that are relatively flat. It is characterized by the relative distance of the contour lines away. Selection of this flat area to avoid geologic hazards can occur at any time. Areas with steep slopes, will likely cause problems later on. One of the geological hazards are avoided is the danger of landslide geological and soil movement. Selection of new settlements was also noticed other geological aspects such as whether there is a major fault line trajectory. Areas that are in the path of major faults can lead to problems such as soil movement and landslide hazards. In addition, site selection is also based on the location of the road. Position that settlements are a bit away from arterial roads will provide comfort for the occupants as it can avoid the noise. And in this location, type of course is a collector street that day-to-day was not so crowded with vehicular traffic. The next consideration is the location of the remote location of the River Plumbon, this is done in order to minimize any hazards such as erosion, landslides and overflowing rivers in the rainy season. As for the residential land use in the Village Ngadirgo is one of the new settlements that have been built by the developer Bukit Semarang Baru. This settlement is located on the roadside despite artery, but the street is not crowded so it does not cause noise on residents in these settlements. 2. Referrals Agricultural Land Use Direction of new agricultural land use is intended to increase the utilization of river water flow is in the Village Wonolopo and Wonoplumbon. Some land was vacant land or moor is located in the Village Wonolopo be converted into agricultural areas irrigated with river flow utilizing Plumbon. So it is with some forest and plantation areas hard hit in the Village Wonoplumbon can be recovered into
  20. 20. 17 agricultural areas irrigated with river water flow utilizing Blorong are quite heavy. The presence of soil types latosols very suitable for use as agricultural land if supplied with adequate irrigation water, the soil will make it more productive. With the use of this, the level of the people's economy is expected to be better with the new job as a farmer. For agricultural land located in the Village Wonoplumbon swale system because the slope is quite steep. 3. Referral Trade Land Use The only trading center located in the Village Ngadirgo, Wonolopo and Wonoplumbon is Mijen market. Due to the increasing number of people who reside in these three villages, it is necessary to build new trade centers that are accessible to all residents, both derived from the Village Ngadirgo, Wonolopo and Wonoplumbon. New trade center is placed in the middle area of the Village Ngadirgo, Wonolopo and Wonoplumbon. Construction of trade center is a follow-up of the construction of new settlements in the Village Wonoplumbon. This is because the distance between the village Wonoplumbon Mijen market is quite far away. So with the new trade center, day-to-day needs of residents in the surrounding village Ngadirgo, and in particular the Village Wonoplumbon Wonolopo can be more easily met.
  21. 21. 18 BAB III CONCLUSION Based on the results of the discussion and analysis of the data obtained in the field, it can be concluded as follows: Ngadirgo Village, Wonolopo Village, and Wonoplumbon Village has an area about 19.02 km2 with rainfall levels from 27.7 to 34.8 mm / year. Most of the geological conditions is dominated by sandstone and breccia from the formation of resin and kaligetas formation. Area of the research is an area of the fractures structure and fault, landforms largely a hilly area. Land use in the study area is dominated by plantations and forests. The type of soil that can be found is the reddish brown latosol with sandstone and breccia as its constituent. Area of the study is an area of the aquifer with moderate productivity and drained two rivers, Plumbon River and Blorong River. Based on the geological aspects of the physical state in the Village Ngadirgo, Wonolopo and Wonoplumbon, it can be automatically conclude the potential and constraints that are contained in the three villages. Geological potential in Ngadirgo village, Wonolopo and Wonoplumbon is latosol soils that have a high nutrient, found in two watersheds that have high water discharge and groundwater conditions with moderate productivity. While the constraints contained in Ngadirgo village, Wonolopo and Wonoplumbon is the ground movement ranging from low-to middle-ground movement which at times can lead to the occurrence of landslides. Related to geological aspects as well as potential and constraints in Ngadirgo Village, Wonolopo and Wonoplumbon with urban and regional planning, then it will get an suitability output of land where the village Ngadirgo, Wonolopo and Wonoplumbon have suitability of land as a cultivated area and the buffer zone. At existing circumstances, cultivation area in Ngadirgo, Wonolopo and Wonoplumbon widely used by residents as residential areas, farms, plantations and fields. As for the buffer zones were encountered at Blorong River flow area used as a non-production forest and production forest. 18