Penentuan Konstanta Resesi Hidrograf Menggunakan Metode Plot Semi Logaritmik (Studi Kasus di Sub DAS Goseng)
Abstract: Recession curve is a
spesifc part of stream hygrograph after it reachs peak flow and it represents the
withdrawal of groundwater from storage. Daily recession constant of surface
runoff, interflow, and baseflow have been derived for 15 segments on Goseng
subwatershed with area approximately 596 ha.Semi logarithmic plot is recession
analysis method which plotting stream discharge in y-ordinate and time in
x-coordinate in semi logarithmic scale. The start of time recession is denoted
by a straight line in the graphic. This method was used for separating a
hydrograph into linear components of surface runoff, interflow, and baseflow. The
results of the research shows that recession segment from daily hydrograph has
short time and does not have all three stream components. A short segment can
only be divided into two flow components. Separation pattern for water catchment
area are baseflow-interflow, baseflow-surface runoff, and interflow-surface runoff.
Recession constant value differ from year to year but the differences do not
have great influence in determining the average value of recession constant.
Keywords: surface runoff,
interflow, base flow, recession constant, semi logarithmic plot Diterima: 26
Agustus 2008; Disetujui: 3 Pebruari 2009
Penulis: Putu Sudira, Sukresno,
dan Elly Kurniawati
Kode Jurnal: jppertaniandd090106

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