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首页> 外文期刊>Journal of Hydrology >Management of minimum lake levels and impacts on flood mitigation: A case study of the Yahara Watershed, Wisconsin, USA
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Management of minimum lake levels and impacts on flood mitigation: A case study of the Yahara Watershed, Wisconsin, USA

机译：对湖泊水平的最小湖泊水平管理 - 以美国威斯康辛yahara流域为例

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Lake level regulation is commonly used to manage water resources and mitigate flood risk in watersheds with linked river-lake systems. In this study, we first assess exposure, in terms of both population and land area, to flooding impacts in the Yahara Watershed's chain of four lakes in southern Wisconsin as affected by minimum lake level management. A flooding exposure assessment shows that the areas surrounding the upstream lakes, Mendota and Monona, have dense urban areas with high populations that are exposed to flooding; Waubesa has low elevations along its lakeshore, resulting in a large potential flooding area; and the most downstream lake, Kegonsa, has a large area of surrounding cropland that is exposed to flooding but impacts a limited population. We then use a linked modeling framework of a land surface model (Agro-IBIS) and a hydrologic-routing model (THMB) to simulate daily lake level over a study period of 1994-2013 in the Yahara Watershed with different minimum lake level management strategies. Modeling results show that the peak lake levels and corresponding exposed land area and population to flooding will decrease under a lower target minimum lake level. However, at the same time, the number of days that the lake level is below winter minimum will increase, which may adversely affect ecosystem health. In addition, our sensitivity analysis indicates that reducing target minimum lake levels will help mitigate flood risk in terms of both flood magnitude and frequency. Nevertheless, this must be balanced against the need to maintain adequately high lake levels for ecosystem services and recreational functions of the lakes.
机译：湖泊等级法规通常用于管理水资源，并利用链接河湖系统的流域洪水风险。在这项研究中，我们首先在人口和土地面积方面评估暴露，以洪水淹没威斯康星州南部四湖连锁的影响，这是受最低湖泊等级管理的影响。洪水曝光评估表明，周边湖泊，Mendota和Monona周围的地区，具有浓郁的城市地区，具有洪水的高种群; Waubesa沿着湖岸的高度低，导致潜在的洪水区;而最下游的湖泊Kegonsa，拥有大面积的周围农田，暴露于洪水，但人口有限。然后，我们使用土地表面模型（Agro-Ibis）的链接建模框架和水文路由模型（THMB）来模拟1994 - 2013年在Yahara流域的一项研究期间的日常湖泊水平，其具有不同的最低湖泊级别管理策略。建模结果表明，在较低目标最小湖泊水平下，峰湖水平和相应的暴露土地面积和人口将减少。但是，与此同时，湖泊水平低于冬季最低的天数将增加，这可能会对生态系统健康产生不利影响。此外，我们的敏感性分析表明，减少目标最小湖泊水平将有助于减轻洪水幅度和频率的洪水风险。尽管如此，这必须均衡，以保持对生态系统服务和湖泊的娱乐功能的适当高湖泊。

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