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A GIS-bsed Solution for using Hec-HMS Modclark Hydrologic Model in Iran
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Ali Kalantari Oskuei *   , Bahram Sagafian , Ali Asghar Alesheikh |
| Institute for Soil and Water Conservation |
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Abstract: (8852 Views) |
| Preparing data based on SHG coordinate and DSS format are known as among the main problems in running modclark hydraulic model within Hec-HMS. The main goal of this research has been providing a solution for the mentioned problem. To this end, Garango watershed was selected as the study area and a GIS-based research was conducted for determining flood intensity and prioritizing flood yield potential using Unit Response Approach and Modclark model in Hec-HMS environment. Rainfall-runoff gages measurements, gridded basin file, gridded precipitation file, gridded SCS curve number file, time of concentration and storage coefficient were the main required data to execute the research model. To do this research, the boundaries of Garango watershed and its four subwatersheds along with stream network were delineated using 1:25000 topographic maps. The map of Digital Elevation Model (DEM) and slope map of watershed were generated and then the physiographic characteristics of the subwatersheds extracted in GIS environment. In the next step, gridded basin file was created using HEC-GeoHMS, based on Standard Hydrologic Grid (SHG). One hour duration rainfall intensities were extracted and then using interpolation method, a gridded precipitation file was generated based on SHG coordinate system and DSS format. Gridded SCS curve number was also created and saved as DSS file. The next step was dedicated to calibrate and validate ModClark hydrologic model at the watershed outlet. Based on the flood index per area (f), Almalochai subwtershed was identified as the most flood active area. As a feature work, it was recommended that in Modclark-base simulations studies, different dimensions of SHG to be examined and the suitable grid dimension (a) be introduced for managing the flood area watersheds. |
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| Keywords: IS, Modclark, SHG, Unit Response Approach |
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Full-Text [PDF 1836 kb]
(2611 Downloads)
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Type of Study: Research |
Received: 2015/02/19 | Accepted: 2015/02/19 | Published: 2015/02/19
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