Application of a flood inundation model to analyze the potential impacts of a flood control plan in Mundeni Aru river basin, Sri Lanka
Application of a flood inundation model to analyze the potential impacts of a flood control plan in Mundeni Aru river basin, Sri Lanka
复制标题
应用洪水淹没模型分析斯里兰卡蒙代尼阿鲁河流域防洪计划的潜在影响
DOI：
10.1007/s11069-017-3143-5
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发表时间：
2018
期刊：
影响因子：
3.7
通讯作者：
G. Amarnath
中科院分区：
文献类型：
--
作者：
Shuhei Yoshimoto;G. Amarnath
掌握洪水淹没范围是减灾决策的重要依据。卫星图像通常用于洪水测绘，但也有局限性，例如由于卫星的轨道周期或云层覆盖而无法获得。此外，政策制定者还可以了解水管理措施（例如储水方案）对缓解洪水和加强灌溉水的影响。洪水淹没模型的利用将支持提供这些需求的信息。在这项研究中，全径流淹没（RRI）模型应用于在斯里兰卡东部的洪水易发流域，其适用性进行了讨论。RRI模型能够模拟洪水期间的流量和淹没范围，但应注意的是，该模型仅针对洪水期进行了校准。用比例因子校正的卫星观测降雨量数据能够用作模型输入，与应用测量降雨量数据时一样，模拟径流的长期趋势。校准模型还能够通过模拟有和没有洪水捕获操作的排放来评估现有和拟议的蓄水方案的防洪效果。通过利用卫星降雨量数据再现长期流入储存设施的情况，可以确定即使在降雨量低的年份，水也会达到拟议储存设施的最高水位。
Capturing inundation extent by floods is indispensable for decision making for mitigating hazard. Satellite images have commonly been used for flood mapping, but there are limitations such as unavailability due to satellite’s orbital period or cloud cover. Additionally, it would also be beneficial for policy makers to figure out the impact of water management measures such as water storage options on flood mitigation and irrigation water strengthening. Utilization of flood inundation models would support providing information for these demands. In this study, the rainfall–runoff inundation (RRI) model was applied in a flood-prone basin in eastern Sri Lanka, and its applicability was discussed. The RRI model was capable of simulating discharge and inundation extent during flood events, although it should be noted that the model had been calibrated targeting only the flooding period. Satellite-observed rainfall data corrected with a scale factor were able to be used as the model input to simulate long-term trends in runoff just as well as when gauged rainfall data were applied. The calibrated model was also capable of evaluating flood mitigation effects of existing and proposed water storage options by simulating discharge with and without flood capture operations. By reproducing long-term inflow to the storage facilities using satellite rainfall data, it was possible to determine that water would reach the maximum level of the proposed storage facilities even during low-rainfall years.