Application of GETFLOWS and HEC-RAS in Assessing Sediment Balance Within River Estuary

River plays an important role in the human need as it provides water for human usage, irrigation, agriculture and industry as well as a range of other ecosystem services other than intrinsic and biodiversity values. Managing the river can lead to many benefits and convenience. However, due to lack of proper management, rivers can be easily polluted due to human activities. Sediment is one of the components that can damage the ecosystem and diversity of the river especially in local spots which involves soil erosion. Heavy rainstorms can cause an excessive erosion event, however, most soil erosion happens gradually over time and is very hard to notice without constant monitoring. Furthermore, the sediment will be mobilized and transported along the river and eventually stored in the bottom of the river, but usually it will deposit near the estuary. A sediment modeling is needed to carter this problem as to predict the behavior of the sediment based on the hydrological components. The comparison between the 1D (HEC-RAS) and 3D (GETFLOWS) will be discussed in this paper to check the suitability and the validity of the model in sediment studies.