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首页> 外文期刊>International journal of river basin management >Hydrological modelling of the Zambezi River Basin taking into account floodplain behaviour by a modified reservoir approach
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Hydrological modelling of the Zambezi River Basin taking into account floodplain behaviour by a modified reservoir approach

机译：赞比西河流域的水文模型，通过改进的水库方法考虑了洪泛区的行为

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摘要

Floodplains are regions of great interest for environmental assessment as they constitute important ecological reserves and contribute efficiently to natural flood attenuation. However, the implementation of a model describing the basic hydrological behaviour of floodplains is not an easy task due to the complexity of the processes included. Although several attempts have been made to simulate floodplain effects in global rainfall-runoff models, no satisfactory routines have been developed yet. In this study, an adapted version of the Soil and Water Assessment Tool (2009) reservoir model is proposed and applied to the Zambezi Basin at daily time step with the intention of adequately modelling floodplain behaviour. The model separates the outflow of the reservoir simulating the floodplain into main channel flow and flow over the floodplain area. The improved solution was compared with the original model regarding its potential to simulate observed discharges in terms of volume ratio, the Nash-Sutcliffe coefficient and hydrograph plots. These evaluation criteria attest, for both calibration and validation periods, that the modified model is superior to the original one for simulating the discharge downstream of large floodplains. A sensitivity analysis is carried out at two geographical levels: at the outlet of a floodplain and at the outlet of the entire basin. The results show that upper flow parameters are more sensitive than base flow parameters.
机译：洪泛区是重要的环境评估区，因为它们构成重要的生态保护区，并有效地促进了自然洪水的衰减。但是，由于所包含过程的复杂性，描述洪泛区基本水文行为的模型的实施并非易事。尽管已进行了多种尝试来模拟全球降雨径流模型中的洪泛区影响，但尚未开发出令人满意的例程。在这项研究中，提出了土壤和水评估工具（2009）储层模型的改编版本，并在每天的时间步长应用于赞比西河流域，目的是对洪泛区行为进行充分建模。该模型将模拟洪泛区的水库流出物分为主要渠道流量和洪泛区上空流量。将改进后的解决方案与原始模型进行比较，就其潜力而言，可以通过体积比，纳什-苏克利夫系数和水位图来模拟观察到的流量。这些评估标准在校准和验证期间均证明，修改后的模型优于用于模拟大洪泛区下游排放的原始模型。敏感性分析是在两个地理级别上进行的：在洪泛区的出口和整个盆地的出口。结果表明，上部流动参数比基础流动参数更敏感。

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    THEODORA COHEN LIECHTI; JOSE PEDRO MATOS; DAVID FERRAS SEGURA; JEAN-LOUIS BOILLAT; ANTON J. SCHLEISS;

  • 作者单位

    Laboratory of Hydraulic Constructions (LCH), Ecole Polytechnique Federate de Lausanne (EPFL), Station 18, CH-1015 Lausanne, Switzerland;

    Laboratory of Hydraulic Constructions (LCH), Ecole Polytechnique Federate de Lausanne (EPFL), Station 18, CH-1015, Lausanne, Switzerland, SHRHA, Instituto Superior Tecnico (IST), Technical University of Lisbon (UTL), Av. Rovisco Pais, Lisboa 1049-001, Portugal;

    Laboratory of Hydraulic Constructions (LCH), Ecole Polytechnique Federate de Lausanne (EPFL), Station 18, CH-1015, Lausanne, Switzerland, SHRHA, Instituto Superior Tecnico (IST),Technical University of Lisbon (UTL), Av. Rovisco Pais, Lisboa 1049-001, Portugal;

    Laboratory of Hydraulic Constructions (LCH), Ecole Polytechnique Federate de Lausanne (EPFL), Station 18, CH-1015 Lausanne, Switzerland;

    Laboratory of Hydraulic Constructions (LCH), Ecole Polytechnique Federate de Lausanne (EPFL), Station 18, CH-1015 Lausanne, Switzerland;

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  • 正文语种 eng
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  • 关键词

    hydrological modelling; floodplain; sensitivity; calibration;

    机译：水文模拟;洪泛区灵敏度;校准;

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