Hydrological modelling ahas an advantage on river flood study.
Hydrological factors can be easily determined and calculated
using
hydrological modelling software for flood similation and
encroachment analysis of floodlain area. For spatial perfomance and analysis of flood, the integration of the Geographic Information Systems (GIS) and hydrological model is needed.
The aims of the research are :
1. to perform a flood encroachment using HEC-RAS software,
2. to generate a flood hazard map.
The methodology for is research comprise of:
1) generating geometric data as a requirement of the data input on HEC-RAS hydrological model
2) Hydrological data inputting
3) Generating of the flood encroachment analysis
4) Transformation of flood encroachment inti flood hazard map
The spatial pattern of the flood hazard is illustrated in a map. The result shows that hydrological model is as integration with GIS can be used for flood hazard map generation. This method has advantages on the calculation of the hydrological factors of flood and spatial performance of the flood hazard map. For furthe analysis, the landuse map can be used on the overlay operation with the flood hazard map in order to obtain the impact of the flood on the landuse.
Keywords: Flood Hazard Map, Hydrological Model and GIS
Research Beground
1. HEC-RAS (Hydrolical Engineering Centre-River Analylisis System)
2. Graphical User Interface), this componen hydraulic analiysis components, data storage, management capabilities.
3. Steady flow water surface profile
4. steady flow water surface profile for aplication in floodplain management and floodway encroachement
5. Compabilitiy HEC-RAS sofware
a. Hydrological Model
b. Water surface profile
c. Visualisation and mapping floodplain, and
d. Geomatric exstraction model
Research Model:
1. HEC-RAS metodological Model
2. Hydrological database input
3. Floodway scenario
4. Result model for transformation SIG format for floodplain dangerous area
Geonetrical Database:
1. Stream centerline
2. Main channel bank
3. Flow path centerlines
4. Cross-sectional cut lines
5. Manning Polygon Map
6. Digital Elevation Model (DEM), on format Triangulated Irreguler Network
Research result:
1. Sreen digitizing for arc view software
2. Stream centerline
3. Cross section
4. Study flow analysis on plain encroachment option
Diferrent Analysis floodplain
1. Encrochment ( air melampaui batas banjirr (indonesia))
2. Flood plain area (dataran banjir (indonesia))
Indonesia