جستجوی مقالات مرتبط با کلیدواژه « حوضه آبریز شهری » در نشریات گروه « آبخیزداری، بیابان، محیط زیست، مرتع »

In this study SWMM software has been calibrated with real meteorological and hydrometric data at the North of Tehran basins and simulation parameters have been obtained. For this purpose, five rainfall events and runoff data related to these rainfalls, recorded at the outlet of Zargandeh catchment were used. This model is calibrated with three events and verified with two other events. Also, in this simulation the peaks of flood, outflow hydrographs, runoff volumes and peak flood times is obtained. The root mean square error are obtained for outlet hydrographs for the first to fifth events were 0.05, 0.22, 0.4, 0.37 and 0.16, and the Nash-Sutcliffe coefficient are obtained 0.91, 0.94, 0.93, 0.9 and 0.94, respectively. Also, the percentage of difference of the flood discharge peak modeling and observations for first to fifth events are calculated 7.33%, 9.69%, 5.8%, 5.6% and 9.93% and for runoff volume, this percentage difference are calculated -8.82%, -3.08%, 8.8%, -19.43% and 5.11%, respectively. Based on these results, the performance and application of this model to simulate runoff in this area is acceptable and can be used to manage and control urban runoff.

The use of retarding reservoirs is one of the methods of urban flood management structures to reduce the volume or intensity of floods as well as repulsed of flooding flows. In this research, the effect of intercity retarding reservoirs on flood peak discharge and the dimensions of conduits was analyzed in one of the subcatchment of Sari (Gozarkhan) for this purpose, after determine the designing rainfall with 5 years return period based on SCSIIchr('39')s method and the concentration time of subcatchments was calculated by using the experimental methods of Kerby and Kirpich, the simulation of the network without reservoirs was performed by using SWMM software and the flood peak discharge and the dimensions of conduits were determined then, with flood retarding reservoirs, re-simulation and the effect of reservoirs on peak of output discharge and the dimensions of conduits were determined. In order to determine the volume of flood retarding reservoirs, first by considering several quantity for volume and drawing output discharge and  variations graphs in relation to the volume of the reservoir, for each reservoir, the volume with the lowest rate of variation of the discharge was considered as the optimal amount. The results show that the retarding reservoirs reduce the flood rate in output node 3266, 86% and in output node 4004, 89%, as well as the dimensions of the conduits (average cross-section of conduits) reduce 57% in study area.