Mohammad Golshan; Abazar Esmaili; ali afzali; Afshin Jahanshahi
Abstract
Simulation with using of computer models are developing very fast and these models are essential tools for understanding of man from the watershed and hydrological processes. In this study IHACRES and HEC-HMS rainfall runoff models was used for simulation of four flood hydrographs in Kasilian watershed ...
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Simulation with using of computer models are developing very fast and these models are essential tools for understanding of man from the watershed and hydrological processes. In this study IHACRES and HEC-HMS rainfall runoff models was used for simulation of four flood hydrographs in Kasilian watershed with area 67.8 square kilometers in Mazandaran province. To prepare the Requirements maps for running HEC-HMS model was used HEC-GeoHMS extension. Hyetograph data with 15 minutes time step and its related hydrograph was entered to two models based on 1 hour time step. Then simulation of the flood hydrograph was done based on 15 minutes time step. CP and RE% statistical coefficients was used for evaluation of models performance. Values of this coefficients using the HEC-HMS model for flood 26 November 1994 was calculated 0.72 and 118.26 respectively and for flood 6 October 1996, 0.89 and -24.63 respectively and using the implementation of IHACRES model these coefficients in the first flood was calculated 0.63 and 152.4 respectively and in the second flood 0.79 and -35.6 respectively. The results showed that both use models have acceptable performance for simulation of flood hydrograph in this area and HEC-HMS model has better performance in compared with IHACRES model.
hamed nozari; safar marofi; mahnaz edirsh
Abstract
According to the annual damages of flood in Dez river catchment and the lack of information about water quantity which contribute substantially to the flow of the river in the middle sub-basins, the aim of this study was to determine the contribution of sub-basins flow to total basin flood and to identify ...
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According to the annual damages of flood in Dez river catchment and the lack of information about water quantity which contribute substantially to the flow of the river in the middle sub-basins, the aim of this study was to determine the contribution of sub-basins flow to total basin flood and to identify areas of flooding potential. So, the standard precipitation index was calculated to identify the wettest period in the region. Then, the whole basin was divided into 11 sub-basins and subsequently a rainfall-runoff simulation was carried out by using WMS software. Finally, the contribution of each sub-basin to the outlet flood peak was quantified by successively eliminating sub-basins from the simulation process. The result showed that the Dokouheh sub-basin by decreasing the peak flow (40 percent) is the most effective region in flooding. Then, Hamidabaad with 35 percent and Dez dam with 15 percent are the sub-basins with more flood potential, respectively. In addition, to eliminate the effect of sub-basin area, prioritization was done corresponding to the contribution at the outlet per unit area of sub-basins. Dokouheh with 29 percent, Hamidabaad with 25 percent and Dezful with 15 percent were given first, second, and third rank, respectively
Mohammad Sharifi Yazdi; Farhang Ghasriani; Mina Bayat
Abstract
The present research was done in steppic rangelands of Dehno, Kerman province to study theeffects of different harvesting intensities of Artemisia sieberi applying simulation method. Theexperiment was conducted using split plots in a completely randomized experimental designof ten replications to find ...
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The present research was done in steppic rangelands of Dehno, Kerman province to study theeffects of different harvesting intensities of Artemisia sieberi applying simulation method. Theexperiment was conducted using split plots in a completely randomized experimental designof ten replications to find the best grazing intensity. Treatments are including no harvest (as acontrol), 25, 50 and 75% harvest. In each treatment, 10 similar and average plant species wereselected as replications. All dependent variables were evaluated during the study and resultswere analyzed in SAS software. Results showed Minimum and maximum forage productionwas obtained at 25% harvest in 2008 and no harvest treatment in 2009, respectively. Regardingto the obtained results and soil condition, the 50% harvesting intensity is recommended inDehno site to maintain the vigority of Artemisia sieberi that is not dangerous for its survival,healthiness and vigority even in drought conditions.
