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IRJET- Assessing the Influence of the Climatic Factors (CF) on the Sand Contents of Soils (SCS): Effects on Erosion
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IRJET- Assessing the Influence of the Climatic Factors (CF) on the Sand Contents of Soils (SCS): Effects on Erosion
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 12 | Dec 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1410 ASSESSING THE INFLUENCE OF THE CLIMATIC FACTORS (CF) ON THE SAND CONTENTS OF SOILS (SCS): EFFECTS ON EROSION Uja, E.U1, Okereke, N.A.A2, Nwandikom, G.I3, Madubuike, C.N4, Egwuonwu, C.C5 1,2,3,4,5Department of Agricultural and Bioresources Engineering, Federal University of Technology, P.M.B 1526, Owerri, Imo State, Nigeria. ------------------------------------------------------------------------***------------------------------------------------------------------------------ Abstract – This report assesses the influence of climatic factors on the sand contents of soils and the likely effects such could have on the erosion of the sand particles. The sites are located at the humid tropical South Eastern region of Nigeria with at least 60% sand. The climatic factors considered include maximum air temperature (MAT), rainfall amount (RA), solar radiation (SR), and sunshine (S). In the study, the sand contents, as dependable variable were correlated and regressed with the climatic factors, using the IBM SPSS Statistics Software. The sand contents correlated positively with the rainfall amounts but negatively with the maximum air temperature, the solar radiation and the sunshine hours. In the light of these observations, the rainfall amounts showcased itself of having considerable influence in the detachment, transportation and deposition phases of an erosion process, a phenomenum referred to as erosivity. On the other hand the maximum air temperature, the solar radiation and the sunshine hours apparently played their roles in-situ in evaporation of moisture from the soil, surface sealing and crusting which invariably affect the erodibility of the sand particles. Sunshine hours produced the best single parameter, non linear, power, model: Sand content= 2599.592-1.516(solar radiation). This model had comparatively the least standard error of estimate, SE, of 0.313. Correlation analyses carried out between the climatic factors revealed that the climatic factors usually work in synergy to effect an erosion process. The maximum air temperature, the solar radiation and the sunshine hours correlated positively with one another. Keywords: climatic factors, influence, erosivity, sand contents, synergy, erodibility. 1. INTRODUCTION The danger posed by erosion on soils and the environment has continued to cause sleepless nights to researchers. In the light of this, the vulnerability of the Southeastern zone of Nigeria has been stressed [15]. According to the report, gully erosion has annually caused environmental problems and damages estimated at over $100million. Most of these gullies has been noticed to have occurred on bare soils surfaces created by human activities [2]. The consequence is that the bare soil surfaces are exposed to the vagaries of climatic factors (CF). These factors include internal or inherent factors as well as external factors that quite often support the internal factors to aggravate erosion processes. The internal factors are the in-situ soil physical and engineering properties which basically include the soil particle size or soil texture. The texture of the soil tells as much as possible about the soil in one word [5]. Usually various particle sizes are found in soil namely: gravel (2mm – 20mm), sand (0.063mm-2mm), silt (0.002mm – 0.063m), and clay (particles less than 0.002mm) [10]. Sand particles by their nature are cohesionless aggregates of rounded, angular, subangular or angular fragments of more or less unaltered rocks or minerals. They flow freely in a dry state whereas in a wet state they form a cast which crumbles easily. This inert quality makes them prone to the erosion [5] .The soil at the study sites consists of 60.13% of sand. The external factors, on the other hand are those factors that are not inherent on the soils but act on it, influencing its behavior, quite often shattering or detaching it into the delivery system of the erosion process. These factors include CF of rainfall, temperature, sunshine, solar radiation, and relative humidity [14]. The damage being posed by these CF on soils demands urgent attention. Heat related damages are steadily being meted out, not only to our soils but the environment and ecosystems. The earth is seen getting hotter day by day [1]; [6]. The soil has been referred to as the skin of the earth’s crust and as such damages to it should not be allowed [8]; [12]; [13]; [16]. It is very expensive to lose the soil. It takes 300years to form just a centimeter of soil [4]. Though rainfall has been noted in its role and ability to cause erosion, referred to as erosivity [9], this study will attempt to identify other CF and how far the CF work in synergy to cause the erosion process.
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 12 | Dec 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1411 The main objective of the study is to assess the influence of climatic factors on sand contents of soil in a bid to unfold the likely effect it could have on the erosion of the soil. 2. MATERIALS AND METHODS 2.1 The Study Sites The study sites included Afikpo, Akaeze, Akwete, Bende, Egbema, Isieke-Ibeku, Isuochi, Okposi, Orlu, Owerri, Umuna, Okwele, Aba, Igbere, and Owutu-Edda, all in the former Imo State of Nigeria. Table 1: The Representative Soil groups and their Locations S/N USDA FAO Parent Material Location 1 Aqui Paleudult Dystric Nitosol Shale Akaeze 2 Arenic Paleudult Dystric Nitosol Sandy Alluvium Akwete 3 Eutric Tropofluents Eutric Fluvisol Shales and Sandstone Egbema 4 Orthoxic Tropodult Dystric Ferralsol Coastal Plain Sands Owerri 5 Gross Arenic Paleudult Dystric Nitosol Sandstone Isuochi 6 Orthoxic Tropodult Rhodic Ferralsol Sandstone Igbere 7 Plinthic Tropodult Plinthic Acrisol Shales Okposi 8 Typic Dystropepts Dystric Cambisol Sandstone Afikpo 9 Typic Dystropepts Dystric Cambisol Shale Bende 10 Typic Hapludult Orthic Acrisol Shale and Sandstone Okwele 11 Typic Tropaquepts Dystric Gleysol Shale and Sandstone Isieke Ibeku 12 Typic Tropadquepts Eutric Gleysol Shale and Sandstone Umuna 13 Typic Tropudalfs Eutric Nitosol Siltsyone Orlu 14 Typic Tropudult Dystric Ferralsol Coastal Plain Sands Aba 15 Typic Tropudult Ferric Acrisol Shale and Sandstone Owutu-Edda [7] Table 2: The Sand Contents of the Soils
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 12 | Dec 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1412 Table 3: The Climatic Records of Imo State Month Max. Temp (0C) Rainfall amounts(mm) Solar Radiation (W/m2) Relative Humidity (%) Sunshine (hrs) January 33.2 37.1 13.4 62 5.8 February 35.2 34.3 14.9 72 5.2 March 34.2 45.9 14.1 77 5.8 April 33.3 99.6 13.7 77 5.4 May 32.0 298.8 12.9 79 5.5 June 30.4 185.9 11.5 85 3.7 July - - - - - August 29.9 438.2 8.8 88 2.5 September 29.2 622.2 9.2 86 3.0 October 30.3 284.3 10.2 83 4.7 November 32.1 111.7 11.5 77 6.6 December 32.5 0.0 12.8 45 7.0 [11] Table: 4 Summary of the CF CF Range Maximum air temperature ( oC) 29.2-35.2 Rainfall amounts (mm) 34.3-622.2 Solar radiation ( W/m2) 8.8-14.9 Relative humidity ( %) 45-88 Sunshine ( hours) 2.5-7.0 [11] 2.2 Method of Data Analysis The analysis was done using the IBM SPSS Statistics software [3]. The sand contents of the soils, as dependable variables were correlated with the each of the CF of maximum air temperature , solar radiation, relative humidity and sunshine hours, as independable variables. The outcomes that were significant at 0.05 (1-tailed) were noted. Also noted were the strength and nature of the relationship. Regression analyses were then conducted on the significant items using both linear and non-linear (curve estimation) methods. The respective model equations were gathered. The model equations were observed to identify the model equation that comparatively predicted the sand contents of the soils, with the least error of estimate (SE). 3. RESULTS AND DISCUSSIONS 3.1 Results Table 5: Results of Correlation analysis of the Sand contents of the soils with the climatic factors Factorsa Correlation P-Value* Sand / Max. Temp Sand/Rainfall -0.614 0.576 0.022 0.041 Sand/Solar radiation -0.707 0.007 Sand/Rel. humidity 0.230 0.248 Sand/Sunshine -0.538 0.044 * Correlation is significant at 0.05 level (1-tailed) aThreshold values of the Max. air temp was 29.20C, Rainfall was 34.3mm,Solar radiation was 8.8W/m2, Relative humidity was 88% and that of Sunshine hours was 2hours.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 12 | Dec 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1413 Table 6: Strength and nature of relationship between the Sand contents of the soil and the climatic factors Factors R Nature of the Relationship R2 Strength of the Relationship Sand /Max. temp. -0.614 Negative 0.376 Moderate Sand/Rainfall 0.576 Positive 0.332 Moderate Sand/Solar radiation -0.707 Negative 0.500 Medium Sand/Sunshine hours -0.538 Negative 0.290 Low Table 7 : Model Gathering ( Maximum Air Temp versus Sand Content of Soils.) Model Equation R2 Standard error of estimation Linear: Sand content = 279.605-7.041Max.temp 0.376 18.166 Logarithmic: Sand content = 842.817-227.628 In(Max. temp) 0.384 18.056 Inverse: Sand content = -175.642 + 7334.146 ( ) 0.391 17.951 Quadratic: Sand content=1822.215+1.503(Max. temp)2+103.503Max.temp 0.428 18.451 Cubic: Sand content=1822.215+1.503(Max. temp)2+103.503Max.temp 0.428 18.451 Power: Sand content=73043908.42-4.096 In(Max. temp) 0.356 0.345* Exponential: Sand content = 2924.485-0.127Max. temp 0.350 0.347 *Sand content=73043908.42-4.096 In(Max. temp) is hereby selected. Maximum Air Temperature (0C) Fig. 1: Sand content (observed and predicted values) versus maximum air temperature. SandContent(%)
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 12 | Dec 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1414 Table 8: Model Gathering ( Rainfall amount versus Sand content of Soils) Model Equation R2 Standard error of estimation Linear: Sand content = 39.924+0.068Rainfall amount 0.332 19.9055 Logarithmic: Sand content = 5.096+10.004 In(Rainfall amount) 0.207 21.680 Inverse: Sand content = 61.710 -637.944 ( ) 0.087 23.269 Quadratic: Sand content=42.706+5.634E-005(Rainfall amount)2+0.033Rainfall amount 0.339 21.165 Cubic: Sand content=60.758-1.719E-006(Rainfall amount)3+0.002(Rainfall amount)2-0.361Rainfall amount 0.459 20.690 Power: Sand content=21.643+0.170 In(Rainfall amount) 0.171 0.415 Exponential: Sand content = 38.965+0.001Rainfall amount 0.286 0.386* * Sand content=38.965+0.001Rainfall amount is hereby selected. Rainfall Amount (mm) Fig. 2: Sand content (observed and predicted values) versus Rainfall amount. SandContent(%)
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 12 | Dec 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1415 Table 9: Model Gathering (Solar radiation versus Sand content of Soils) Model Equations R2 Standard error of estimation Linear: Sand=146.437-7.638Solar radiation 0.500 16.262 Logarithmic: Sand content = 276.808-89.845 In(Solar radiation) 0.523 15.893 Inverse: Sand content = -33.376 +1028.383 ( ) 0.540 15.601 Quadratic: Sand content=349.242+1.516(Solar radiation)2+43.207Solar radiation 0.556 16.252 Cubic: Sand content=349.242+1.516(Solar radiation)2+43.207Solar radiation 0.556 16.252 Power: Sand content=2599.592-1.592 In(Solar radiation) 0.470 0.313* Exponential: Sand content=259.555-0.136Solar radiation 0.453 0.318 * Sand content=2599.592-1.592 In(Solar radiation) is hereby selected. Solar Radiation (W/m2) Fig. 3: Sand content (observed and predicted values) versus Solar radiation. SandContent(%)
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 12 | Dec 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1416 Table 10: Model Gathering (Sunshine hours on Sand content of Soils). Model Equation R2 Standard error of estimation Linear: Sand=95.444-8.241Sunshine hours 0.290 19.389 Logarithmic: Sand content = 113.495-37.860 In(Sunshine hours) 0.322 18.947 Inverse: Sand content = 19.697 +( ) 0.342 18.656 Quadratic: Sand content=149.047+2.685(Sunshine hours)2-33.383 Sunshine hours 0.344 19.768 Cubic: Sand content=217.483-0.719(Sunshine hours)3+13.163(Sunshine hours)2-81.546 Sunshine hours 0.349 21.053 Power: Sand content=139.266-0.651 In(Sunshine hours) 0.272 0.367* Exponential: Sand content=101.119-0.140 Sunshine hours 0.238 0.375 * Sand content=139.266-0.651 In(Sunshine hours) is hereby selected. Sunshine (hour) Fig. 4: Sand content (observed and predicted values) versus Sunshine hours. SandContent(%)
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 12 | Dec 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1417 Table 11: Regression analysis of the significantly correlated factors of sand content of the soil and the climatic factor of Solar radiation. Climatic Factors and Soil Properties Nature of relationship R2 SE F Model Equation -Power* Sand content and Solar radiation Negative 0.470 0.313 7.977 2599.592-1.592 In(Solar radiation) *Predicted values of the sand content ranged from 89.23 to 9.61%. Table 12: Correlation and Nature of Relationships of the CF. Factors R Nature of the Relationship P-value Strength of the Relationship Max. temp/Rainfall -0.830 Negative 0.001 Good Max. temp/Solar Radiation 0.951 Positive 0.000 Very good Max. temp/Sunshine hours 0.682 Positive 0.010 Medium Rainfall/Solar radiation -0.833 Negative 0.001 Good Rainfall/Sunshine hours -0.807 Negative 0.001 Good Solar radiation/Sunshine hours 0.697 Positive 0.009 Medium 3.2 Discussions Tables 3 and 4 showed that the study had been carried out within the following ranges of the climatic factors: Maximum Air Temperature (290C to 35.20C), Rainfall amounts (34.3mm to 622.2mm), Solar radiation (8.8 to 14.9W/m2), Relative Humidity (45% to 88%), Sunshine hour (2.5hours to 7.6 hours). The results from the correlation analysis as indicated in Tables 5 ad 6 showed that there was no correlation between the sand content of the soil and Relative humidity while it was obvious that the sand content of the soil correlated positively with the Rainfall amount, with the strength of the relationship being moderate. Through the regression analyses carried out using linear and non-linear (Curve fit) methods as could be seen in figures 2, it was noticed that when the rainfall amounts increases, the sand content also increases. This portrayed the devastating nature of the rainfall amounts that usually lead to the detachment, transportation and depositions of the sand particles in the erosion process. As the rainfall amounts increases, the propensity of soil detachment increases as well as the build-up of erosive concentrated overland flow which culminates to increases in the depositions of the erosion process. A negative relationship was observed between the sand contents of the soils and the maximum air temperature, the solar radiation and the sunshine hours as shown also in Table 5. Unlike the cases with the rainfall amounts, the sand content of the soils decreases with increases in the maximum air temperature, the solar radiation and the sunshine hours as could be seen in figures 1, 3 and 4 respectively. This observation indicated that the maximum air temperatures, the solar radiation and the sunshine hours played their roles at the pre-detachment phases of the erosion process. These climatic factors, the air maximum temperature, the solar radiation and the sunshine, apparently influenced the sand content in a manner that made the sand particles prone for detachment into the delivery system, thereby enhancing their erodibility potentials. They heat up the sand, possibly shrinks and separate the particles, making them prone to detachment, transportation and deposition of the erosion process. This outcome is in line with the findings obtained by [9]. In the findings soils with high sand contents of 40 to 60 per cent are considerably erodible. The soils at the study sites contain 60 per cent sand contents. The climatic factors observably played their roles in synergy. Investigations done on this, by conducting a correlation analyses between the climatic factors, had unfolded such, as could be seen in Table 12. The rainfall amounts correlated negatively with each of the other climatic factors, the maximum air temperatures, the solar radiation, the sunshine hours, while the air maximum temperatures, the solar radiation and the sunshine hours correlated positively with one other. The nature and strength of the relationships could also be seen. The maximum air temperatures, the solar radiation and the sunshine appeared to have played complementary role in the evaporation of moisture from the land and sea. This evaporated moisture latter fall as erosive rains, which the rainfall amounts had portrayed.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 12 | Dec 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1418 From Tables 7, 8, 9, 10, and 11, the best single parameter, non-linear, Power, predictor model for the sand content is given as Sand content=2599.592-1.516(solar radiation), which have comparatively the least value for the standard error of estimate, SE, of 0.367. 4. CONCLUSION The climatic factors of air maximum temperature, rainfall amounts, solar radiation, and sunshine had influenced the sand content of the soils in a various patterns. All the patterns apparently supported erosion, playing a role in the detachment phase or the deposition phase of the erosion process. Rainfall amounts play significant role on deposition phase because it provides the delivery system of the erosion process. The more the magnitude of the rainfall amounts, the more the erosivity, the more likely the sand to eroded. At often times, almost all the contents of the sand had been eroded and deposited, within the magnitude of the rainfall amounts of 34.3mm to 622.2mm. The other climatic factors, the air maximum temperature, the solar radiation and the sunshine hours, play dual roles. They work in synergy to remove moisture from the sand, making the sand to crumble and yield in motion to any external forces. Of the moisture evaporated also, rainfall originates to easily carry the defenseless sand particles into the erosion delivery system. The heating on the sand makes them behave like individual particles and when the rain falls, these sand particles easily flow with the torrent of the runoff. These influences had been contained within the ranges of air maximum temperature, 29.20C to 35.20C, Solar radiation, 8.8W/m2 to 14.9W/m2, and Sunshine hours, 2.5hours to 7.0hours. REFERENCES 1) Aganbi, B. M and Bello. “On the Analysis of trend of temperature across Nigeria”: A signature of global warming .In: Proceeding of 2nd International training workshop of the Institute of Erosion Studies (IES), FUTO, 2016. 2) Beckley, M.O. Application of Hydrological Data in Erosion and Flood Mitigation, Proceedings of International Training Workshop on Effective Watershed Management for Environmental Control/Mitigation in Nigeria, Federal University of Technology, Owerri Nigeria, ISBN: 978-978-54526-6-2, 2016. p. 123. 3) Breiman, L. Statistical Modelling: The two cultures. Statistical Science 16(3): Keil Publisher, 2001, pp.199-231. 4) Hudson N.W. Soil Conservation. B.T. Batsford Limited, London, 1986, p.38. 5) Ijioma, C.I. Origin, Formation and Composition of Soils and Rocks. In: Ola,S.A ed. Essential of Geotechnical Engineering, University Press Plc, Ibadan, Nigeria. ISBN 978 978 069 7754, 2013, pp.12-13. 6) John, V.A. Effective Climate change on coastal Erosion and flooding Proceeding of the 1st International training workshop of the IES, FUTO, ISBN: 978-978 54526-6-2 R. Atlas Ent., 2016, pp. 45-57. 7) Madubuike, C.N. Development of Erosivity and Erodibility indices for Soil loss Estimation in Abia and Imo State of Nigeria. PhD Thesis in Department of Agricultural Engineering, University of Nigeria, Nsukka, Nigeria, 1994, pp.49- 122. 8) Miller, Austin. The skill of the Earth 1st ed. London, U.K: Methuen, 1953, Retrieved 18th September, 2016. 9) Morgan R.P.C. Soil Erosion and Conservation. Longman Inc, New York: ISBN O-582-30158-0, 1981, pp.40, 48. 10) Munday, A.J and Farrar, R.A. An Engineering Data Book. University of Southampton, U.K, Macmillan Press Ltd, London: ISBN 0 333 25829 0, 1982, p.64. 11) Nigerian Meteorological Agency (NIMET), (2016). 12) Rajib,K. Potential Effects of Climate change on soil properties: A Review, Science International, India, 2016. 13) Raul, A. Diaz, Graciela. O Maria. I Travasso, Rafael O.Rodriguez.. Climate change and its impact on the properties of Agricultural soils in the Argentinean Rolling Pampas. In: Climate Research, Argentina, Vol.9:pp.25-30, 1997. 14) Schwab, G.O, Fangmeter, D.D, Elliot,W.J, Frevert, R.K. Soil and Water Conservation Engineering, fourth edition, John Wiley and Sons Inc. New York, 1993, p.92. 15) Uzoigwe, L.O.; Chukwuma, E.C.; Samuel, C. and Maduakolam, S.C. Environmental Monitoring and Assessment of Gully Erosion: Causes, Effects and Remediation in Nigeria. Proceedings of International Training Workshop on Effective Watershed Management for Environmental Control/Mitigation in Nigeria, Federal University of Technology, Owerri Nigeria, ISBN: 978-978-54526-6-2, 2016. 16) Varallyay, G. The impact of climate change on soils and on their water management. In: Agronomy Research 8(Special Issue II), 2010, pp.385-396.
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