PEMETAAN BANJIR SUNGAI JUWANA BERDASARKAN SIMULASI UNSTEADY FLOW DENGAN MENGGUNAKAN PROGRAM HEC-GEORAS (FLOOD MAPPING OF JUWANA RIVER WITH UNSTEADY FLOW SIMULATION USING HEC-GEORAS PROGRAM)
Abstract
Juwana River is a river in Indonesia that is vulnerable to flood. It is caused by the
relatively flat slope of Juwana River, which is around 0.00001, and it is influenced by the
narrowing of its channel. The narrowing of the cross-sectional capacity causes floods in rice fields
and residential areas.
This study used ArcGIS 10.2 application to determine the topography, HEC-RAS 4.1
application for modeling the river flow or river analisys system (RAS), and HEC-GeoRAS 10.2
application to process RAS results into the ArcGIS application. The technique used was modeling
the river geometry based on the contour data as well as inputting the upstream and lateral inflow
boundaries. The analysis used was unsteady flow analisys with the return period of 50 years.
The results show that the extent of flood due to the discharge of Juwana River was 37406
ha in Kudus and Pati districts. Areas affected by flood in Kudus District were 449.1 ha of fields,
8772.6 ha of rice fields, and 628.8 ha of settlements. For Pati District, the areas affected by flood
were 1339.8 ha of fields, 17187.6 ha of rice fields, 6713.7 ha of ponds, and 2314,4 ha of
settlements.
Collections
- Civil Engineering [4187]