Pengaruh Perubahan Penggunaan Lahan terhadap Rezim Hidrologi DAS (Studi Kasus : DAS Komering)

Abstract

Upper Komering catchment areas has contribute substantially to Komering basin , South Sumatera. Land use changing has an impact on reducing the infiltration capacity, lead to extremely flow such as floods and droughts in downstream. Adaptation and mitigation to land use changes is an attempt to anticipate malfunctions watershed hydrology. The purpose of writing is to evaluate land use changing affecting hydrology regime at the watershed. The analysis showed land use changing in several period. There is a changing of design discharge from 126.38 m3 / sec to 135.88 m3 / sec (1971-1991 and 1992-2010). The increase in the use of land for farming paddy fields, moors and yields is 80.516%, which reduces the forest area to 28%. Land cover changing especially forest can be as indicator the capacity of watershed retaining water. Runoff coefficient c = 0.399 and base flow values is 43.262 obtained a trend increase in the value of c and b values decrease during 1971-2010. Based on the distribution maps of erosion in 1980 and 2005 represent Upper Komering watershed including poor classification.

Keywords

• Watershed
• landuse
• land cover
• hydrology function