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Assessment of flood mitigation strategies for reducing peak discharges in the Upper Cedar River Watershed.

机译：评估减少雪松河上游流域洪峰排放的缓解洪灾策略。

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摘要

This thesis evaluates the effectiveness of several flood mitigation strategies for reducing peak discharges in the Upper Cedar River Watershed located in northeast Iowa. Triggered by record flooding in June 2008, the Iowa Watersheds Project was formed to evaluate and construct projects for flood reduction. The Upper Cedar was selected as a pilot watershed and a hydrologic assessment was performed to better understand its flood hydrology. Evaluation of different flood mitigation strategies was performed with HEC-HMS, a lumped parameter surface water model. The hydrologic model development is described and the model applications are analyzed.;The HMS model was used in several ways to better understand the flood hydrology of the Upper Cedar River Watershed. First, the runoff potential of the basin was assessed to identify the primary runoff generation mechanisms. Areas with agricultural land use and moderately to poorly draining soils had the highest runoff potential. Following, the model was used to evaluate the impact of several flood mitigation strategies - increased infiltration through land use changes, increased infiltration through soil improvements, and added storage in the watershed to hold runoff temporarily and reduce downstream flood peaks - for different flood frequency events (the 10-, 25-, 50-, and 100-year, 24-hour design rain storms) and the June 2008 flood. Although each scenario is hypothetical and simplified, they do provide benchmarks for the types of reductions physically possible and the effectiveness of strategies relative to one another. In order to reduce the impacts of flooding in the Upper Cedar, a combination of projects that enhance infiltration and/or store excess runoff will be necessary.
机译：本文评估了几种减轻洪水影响的策略对减少爱荷华州东北部的雪松河上游流域洪峰流量的有效性。由2008年6月的创纪录洪水引发，爱荷华州流域项目成立，以评估和建设防洪项目。上雪松被选为试点分水岭，并进行了水文评估以更好地了解其洪水水文。使用集总参数地表水模型HEC-HMS对不同的防洪策略进行了评估。描述了水文模型的发展并分析了模型的应用。HMS模型被以多种方式更好地理解了锡达河上游流域的洪水水文。首先，对流域的径流潜力进行了评估，以确定主要的径流产生机理。农业用地面积大，土壤排水中等至中等的地区具有最高的径流潜力。随后，该模型用于评估多种洪水缓解策略的影响-针对不同的洪水频率事件，通过土地利用变化增加了入渗，通过土壤改良增加了入渗，并在流域中增加了存储量以暂时保持径流并减少下游洪峰。 （10年，25年，50年和100年的24小时设计暴雨）和2008年6月的洪水。尽管每种情况都是假设性的且经过简化的，但它们确实为物理上可能的减少类型和策略相对于彼此的有效性提供了基准。为了减少上雪松的洪水影响，将需要增加渗透和/或存储多余径流的项目组合。

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  • 作者

    Drake, Chad Walter.;

  • 作者单位

    The University of Iowa.;

  • 授予单位 The University of Iowa.;
  • 学科 Engineering Civil.;Water Resource Management.;Hydrology.
  • 学位 M.S.
  • 年度 2014
  • 页码 228 p.
  • 总页数 228
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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