Preliminary Studies of Sediment Transport and River Silning Modeling for Flood Potential Using SWAT and HEC-RAS Models (Case Study: Citarik Sub Watershed)

Abstract

The Citarik sub watershed is one of the priority sub watersheds in the Upper Citarum watershed. The sustainability of this sub watershed has an important role in maintaining the sustainability of the Citarum watershed, but this sub watershed has experienced a lot of hydrological function degradation. Increasing population and economic activity have resulted in massive changes in land use which is the main issue of this problem. Indications of damage are felt by increasing the maximum extreme discharge, as well as increasing the value of the coefficient of water runoff, giving rise to the phenomenon of flooding in the rainy season, this phenomenon is exacerbated by sedimentation and silting of rivers, which from year to year this flood phenomenon is getting worse and causing a lot of economic losses. Therefore, we need a hydrological and hydraulics modeling of the Citarik Sub watershed which aims to predict sedimentation, river siltation, and their effect on flood potential using QSWAT and HEC-RAS. To produce a good model that maximized all the available data and solved the problems effectively, a preliminary study is needed first. The scope of the preliminary study includes defining the potential problems and analyzing the data avalability of the research location, especially the data that needed to be the input for QSWAT and HEC-RAS model so the validity can be maximalized and represent the actual condition. The results of the preliminary study stated that the Citarik sub watershed is a potential area for further study and modeling because it has many problems ranging from critical land, flooding to sedimentation and has sufficient data availability to develope a model.