Geographic Concerns on Flood Climate and Flood Hydrology in Monsoon-Dominated Damodar River Basin, Eastern India
Geographic Concerns on Flood Climate and Flood Hydrology in Monsoon-Dominated Damodar River Basin, Eastern India
复制标题
印度东部季风主导的达莫达尔河流域洪水气候和洪水水文的地理问题
DOI：
10.1155/2015/486740
复制
发表时间：
2015
影响因子：
6.4
通讯作者：
Biswaranjan Mistri
中科院分区：
文献类型：
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作者：
Sandipan Ghosh;Biswaranjan Mistri
在西孟加拉邦的下恒河平原，达莫达河猛烈的季风洪水是一种反复出现的水文气象现象，人类活动加剧了这种现象。目前，达莫达河流域公司(DVC)的洪水调度系统不能管理来自达莫达河宽阔的扇形上游集水区的大量来水(表现为地表径流和渠道流)。因此，达莫达尔下游流域(覆盖西孟加拉邦的Barddhaman、Hooghly和Howrah地区)每年都会经历从低到高级别的洪水和溢出条件，因为由于过度淤积和排水堵塞，现有的运河系统、河流、古河道和达莫达尔河本身已经失去了以前的承载能力，无法容纳其活跃区域内的所有过剩水。因此，当DVC大坝无法调节洪水流量时，流域上持续时间较长的极端降雨将正常情况转变为毁灭性的洪水，就像1978年和2000年的西孟加拉邦那样。针对达摩达尔河下游存在的问题，利用定量的水文公式，对下游洪水气候潜力进行了评估，并估算了与下游洪水风险增加相关的降雨径流贡献、洪峰流量和河流现有通过能力。
In the Lower Gangetic Plain of West Bengal, the furious monsoon flood of Damodar River is a recurrent hydrometeorological phenomenon which is now intensified by the human activities. At present, the flood regulation system of Damodar Valley Corporation (DVC) is not capable of managing gigantic inflow water (which appeared as surface runoff and channel flow) coming from the wide fan-shaped upper catchment of Damodar River. As a result, the lower basin of Damodar (covering Barddhaman, Hooghly, and Howrah districts of West Bengal) annually experiences low to high magnitude of floods and overflow condition because the existing canal system, streams, palaeochannels, and Damodar River itself have lost their former carrying capacity to accommodate all excess water within its active domain due to over siltation and drainage congestion. So when the DVC dams are not able to regulate flood flow, then extreme rainfall of prolonged duration over the basin turns the normal situation into devastating flood, like the years of 1978 and 2000 in West Bengal. Identifying the existing problems of lower Damodar River, this paper principally tries to assess the potentiality of flood climate and to estimate the contributing rainfall-runoff, peak discharge, and existing carrying capacity of river in relation to increasing flood risk of lower basin using the quantitative hydrologic expressions.
2021年四国山地/中川调查报告书（第1/3卷）
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