MORPHOMETRIC CHARACTERISTIC and GENERATING WATERSHED in DIATAS LAKE West Sumatera by Iwan Ridwansyah
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1. 3DAssignment Iwan Ridwansyah y G051070071 Bogor Agriculture
University 2008
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 lakeislocatedat100o 431 100o 5026Edan1o 151 1o 7
39S. This lake is that one oftwin lake , on the north be found
another lake l d b l k caled Dibawah Lake. h k Both ofthe lake
diposition on GreatSumatrafault andto certain formed b t t i
activities (P f d by tectonic ti iti (P. Lehmusluoto andB.Machbub,
1977)
5. BathymetricMap B Volume of Diatas Lake = 302,06 x 106 m3
Surface Area = 12,451,642 m2 A A B
6. RetentionTime Volume Re tension time ( Rt ) = Disch arg e
302x106 m3 1.25m3/sec 7.7year.
MeasurementofwaterflowinoutletofLake(used Currentmeter)
Thetimerequiredtorefillanemptylakewithnaturalinflow. R t ti ti i d
dt d t Retentiontimeisneededtodetermineanannuallakebudgetsforwater,
i ll k b d t f t nutrient,heat,oxygencontaminants,andherbicides
ItsAlsoprovideanestimateontheturnovertimeforwaterinalike,or
flushingtime flushingtime
7. MorphometrycharacteristicofLakeDiatas 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. GENERATINGWATERSHED SRTMdata 3DAnalyst DerivedContur
HydrologyModel DigitizeonScreen WatershedBoundary WatershedBoundary
W t h dB d
9. HYDROLOGYMODEL
10. CalculatingFlowAccumulation C l l i Fl A l i
11. GeneratingStreamChannel g
12. GeneratingStreamLink G i S Li k
13. GeneratingWatershed g Differencebetween digitizeonscreenand
Hydrologymodel
14. ComparedDigitizeandHydrologymodel Differencebetween
digitizeonscreenand g Hydrologymodel
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.