STUDI PERUBAHAN KARAKTERISTIK PARAMETER HIDROLOGI DENGAN MENGGUNAKAN MODEL SACRAMENTO, STUDI KASUS: DAS CIMANUK

• Main Author: Sarminingsih, Anik
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/7230
• Institution: Institut Teknologi Bandung

A study about characteristict changing of hydrologic parameter has been done to know how much landuse characteristic changing against streamflow parameter, as case study is Cimanuk basin. The method which used to study the characteristic changing of hydrologic parameter is conceptual model of Sacramento model, because this model can described all components which will be known it changes. Besides studied the characteristic of hydrologic parameter changing, this study also have been done by statistical model (correlation and regression) to know the trend of extreem discharge and runoff coefficient. The results show there are landuse changing especially increasing land for settlement, plantation and dryfield, but there are decreasing land for irrigation and forest areas. The main land coefficients of Sacramento model that calculate every year generally have changed. Increasing the impervious area influent in increasing of PCTIM and ADIMP but decreasing the RNA and LZK. This changing directly increased direct runoff and increase groundwater flows. Capacity of free water and tension water both of upper zone and lower zone have a constant trend. The upper zone coefficient of drainage (UZK) has decreasing trend, which cause increasing of interflow. While, the groundwater coefficient (LZK) has increasing trend that caused decreasing baseflow. The tendency of extreme discharge shows that minimum daily discharge is decrease, while maximum daily discharge is increase. Result of the analysis shown that runoff coefficient also increased if seen of the year before 1980 and after 1980 (from 0.52 to 0.55 at Leuwigoong and from 0.43 to 0.47 at Tomo)