Analysis of Bifurcation Ratio and Drainage Density in Ciemas, Cihaur, Girimukti and Sangrawayang Areas, Sukabumi District, West Java Province

Quantitative geomorphological analysis is a way to interpret an area based on geomorphological data that can provide an overview of geological conditions and the processes that take place in it presented in a thematic map. The research area is located in Ciemas, Cihaur, Girimukti, and Sangrawayang areas, Sukabumi Regency, West Java Province. The study was conducted to determine the morphometric characteristics of the catchment area using ArcGIS software. The morphometry aspects to be studied consist of linear aspects (stream order (u), stream length (Lu), mean stream length (Lsm), stream length ratio (RL), bifurcation ratio (Rb), mean bifurcation ratio (Rbm). Areal aspects (drainage density (Dd), stream frequency (Fs), drainage texture (Rt), form factor (Rf), circularity ratio (Rc), elongation ratio (Re), length of overland flow (Lg). Based on the results of data processing, the study area was divided into 9 catchment areas with various morphometric characteristics. In general, the study area is not affected by strong structural control, the process of rapid lowering of the water level with a very rough density. Almost all catchment areas are dominated by an elongated shape and some rounded catchment areas. The length of the river surface flow each catchment area has a moderate flow with a rectangular drainage pattern type.