Vol 6, No 5 (2015) > Civil Engineering >

Estimation of Sediment Yield in a Small Urban Ungauged Watershed based on the Schaffernak Approach at Sugutamu Watershed, Ciliwung, West Java

Dwita Sutjiningsih, Herr Soeryantono, Evi Anggraheni

 

Abstract:

The
sediment yield is defined as the amount of sediment discharged by an area for a
given period of time. Schaffernak proposed to estimate sediment yield in a
watershed based on a sediment
duration curve. The research objective is to test the applicability of a modified Schaffernak approach in
estimating annual sediment yield in Sugutamu, a small urban watershed subsystem
of the Ciliwung River where
hardly any necessary data is available. The discharge-duration curve is
developed based on daily runoff simulation using a hydrological model WinTR-55, while the
sediment rating curve is derived based on field surveys and is developed only for a total suspended solid. The
results of field surveys
conducted in January 2015 were used for calibrating the physiographical
parameters of the watershed as input data for WinTR-55, and the simulation was
for the year 2014. Both calibration and simulation processes utilized the
rainfall data from a nearby automatic rainfall recorder. The quantification of sediment yield resulted in 108.5 tons/km2/year, which is
acceptable when compared to the results of similar studies. The results showed that sediment yield from ungauged watershed are possible to be quantified using
modified Schaffernak approach in combination with WinTR-55 application. Further study is needed in order to validate the
applicability of the approach in similar
conditions.

Keywords: Modified Schaffernak Approach; Sediment duration curve; Sediment yield; Small urban ungauged watershed; WinTR-55 Hydrological Model

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