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Floodplain Delineation Using HECRAS Model—A Case Study of Surat City

机译:HECRAS模型的洪泛区划定-以苏拉特市为例

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Surat city, the commercial capital of Gujarat state, India is situated at latitude 21°06’ to 21°15’ N and longitude 72°45' to 72°54'E on the bank of river Tapi and is affected by flood once in every five years since last hundred years. Present study describes the application of HEC-RAS model with integration of GIS for delineation of flood plain. Digital Elevation Model (DEM) of Surat city is used as main input for flood inundation mapping. River section near Nehru Bridge is used as sample case to simulate flood flow. Discharges equal to food return period for 25 and 32 (worst flood year) have been used for investigation of flood scenario. Outcome of the research clearly indicates that most of the area of the Surat city is submerged for a depth of 2.5 to 4.0 m when the discharge released from Ukai dam equals to return period of 32 years (25768.09 Cumecs).
机译:印度古吉拉特邦的商业之都苏拉特市位于塔皮河河岸,北纬21°06'至21°15'N,东经72°45'至72°54'E,一度受到洪水的影响从最近一百年开始每五年。目前的研究描述了HEC-RAS模型与GIS集成在洪泛平原划定中的应用。苏拉特市的数字高程模型(DEM)被用作洪水淹没制图的主要输入。以尼赫鲁大桥附近的河段为例,模拟洪水流量。等于粮食返还期的25年和32年(最严重的洪水年份)的排放量已用于洪水情景的调查。研究结果清楚地表明,当Ukai大坝释放的排水量等于32年的恢复期(25768.09 Cumecs)时,苏拉特市的大部分地区都被淹没了2.5至4.0 m的深度。

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