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Iwan Ridwansyah Morphometricand Watershedof Lake Diatas

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MORPHOMETRIC CHARACTERISTIC and GENERATING WATERSHED in DIATAS LAKE West Sumatera
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Iwan Ridwansyah

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Iwan Ridwansyah Morphometricand Watershedof Lake Diatas

  1. 1. 3D Assignment Iwan Ridwansyah y G051070071 Bogor Agriculture University 2008
  2. 2. Lake Morphometrics1 is a field concerned with studying variation and change in the form (size and shape) of the Like.[1] There are g ( p ) several methods for extracting data from shapes, each with their own benefits and weaknesses. These include measurement of lengths and angles, landmark analysis and outline analysis. Diatas lake is located  at 100o 43” 1”  – 100o 50’ 26” E dan 1o 1’ 51” – 1o 7’  39” S .  This lake is that one of twin lake ,  on the north be found another lake l d b l k caled Dibawah Lake. h k Both of the lake diposition on Great Sumatra fault and to certain formed b t t i activities (P   f d by tectonic ti iti (P.  Lehmusluoto and B. Machbub,  1977)
  3. 3. Study ea Study Area
  4. 4. Bathymetric Mapping Method GIS 3DAnalyst Bathymetric Map
  5. 5. Bathymetric Map B Volume of Diatas Lake = 302,06 x 106 m3 Surface Area = 12,451,642 m2 A’ A B’
  6. 6. Retention Time Volume Re tension time ( Rt ) = Disch arg e 302 x 106 m3 1.25  m3/sec 7.7 year. Measurement of water flow in outlet of Lake (used  Current meter) The time required to refill an empty lake with natural inflow. ‐ R t ti  ti  i   d d t  d t Retention time is needed to determine an annual lake budgets for water,  i     l l k  b d t  f   t   nutrient, heat, oxygen contaminants, and herbicides ‐ Its Also provide an estimate on the turn over time for water in a like, or  “flushing time” flushing time
  7. 7. Morphometry characteristic of Lake Diatas No. No Parameter Dimension Source 1 Surface Area (m2) 12451642 Rupa bumi Map 2 Perimeter (km) 19.97 idem 3 Ma im m Length Maximum (m) 6419 idem 4 Maximum Wide (m) 2878 idem 5 Maximum depth (m) 47 Field 6 Volume (m3) 302 06 x 106 302.06 Bathymetric Map 7 Depth Average (m) 24.3 Calculation 8 Relative Depth (Zr) (%) 1.18 idem 9 Short Line Development (DL) 1.59 1 59 Idem 10 RetentionTime (year) 7.7
  8. 8. GENERATING WATERSHED SRTM data 3D Analyst Derived Contur Hydrology Model Digitize on Screen Watershed Boundary Watershed Boundary W t h d B d
  9. 9. HYDROLOGY MODEL
  10. 10. Calculating Flow Accumulation C l l i  Fl  A l i
  11. 11. Generating Stream Channel g
  12. 12. Generating Stream  Link G i  S   Li k
  13. 13. Generating Watershed g Difference  between  digitize on screen and  Hydrology model 
  14. 14. Compared Digitize and Hydrology model Difference  between  digitize on screen and  g Hydrology model 
  15. 15. Reference WETZEL, R. G. 1983. Limnology. W. B. Saunders College Publ., Philadelphia. 743 pp. P Lehmusluoto et all 1995 National Inventory of The Major Lakes and Reservoirs in Indonesia P. Lehmusluoto, all, 1995, Indonesia, Research Institute for Water Resources Development Ministry of Public Works Agency for Research and Development Bandung, Indonesia.
  16. 16. Thank You Th k Y

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