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首页> 外文期刊>Journal of Hydroinformatics >Modelling the impacts of reservoir operations on thedownstream riparian vegetation and fish habitatsin the Lijiang River
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Modelling the impacts of reservoir operations on thedownstream riparian vegetation and fish habitatsin the Lijiang River

机译：模拟水库运营对漓江下游河岸植被和鱼类生境的影响

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River flow regulations have great impact on the downstream aquatic ecosystem. It is important to investigate the response of target species to the changes in hydrological regimes so that we can explore possible remediation measures. Ecohydraulics models that integrate hydrodynamics processes and ecological processes have been shown to be efficient in achieving these objectives. This study developed an integrated model which combined a two-dimensional hydrodynamic module with a vegetation evolution module and a fish habitat module. Owing to the ability to represent spatial heterogeneity and local interactions, the vegetation module used an unstructured cellular automata (UCA) approach. To describe the ambiguous relations between the physical conditions and habitat suitability, a fuzzy inference method was applied to the fish habitat module. The developed model was applied to a compound channel of the Lijiang River in southwest China, which has been greatly affected by the flow regulations of the Qingshitan Reservoir for navigation purposes. Through scenario simulations, the effects of flow regulation on riparian vegetation and fish habitat were analyzed. According to the results, water releases in the dry season imposed negative effects on the downstream semi-aquatic plant Rumex maritimus (R. maritimus) and Polygonum hydropiper (P. hydropiper) and favored the upland species Leonurus heterophyllus (L heterophyllus). Regarding to the effects on fish Spinibarbus hollandi (S. hollandi) the results showed that water releases increased the suitability of the spawning conditions, especially during wet and dry years, but had little impact on the overwintering conditions.
机译：河流流量规则对下游水生生态系统有很大影响。重要的是要研究目标物种对水文状况变化的响应，以便我们探索可能的补救措施。已经证明，将流体动力学过程和生态过程相结合的生态液压模型可以有效地实现这些目标。这项研究开发了一个集成模型，该模型将二维水动力模块与植被演化模块和鱼类栖息地模块相结合。由于具有表示空间异质性和局部相互作用的能力，植被模块使用了非结构化细胞自动机（UCA）方法。为了描述物理条件与栖息地适应性之间的模棱两可关系，将模糊推理方法应用于鱼类栖息地模块。所开发的模型被应用于中国西南部漓江的复合航道，该航道受到了青石滩水库通航规则的极大影响。通过情景模拟，分析了流量调节对河岸植被和鱼类栖息地的影响。根据研究结果，干旱季节的水释放对下游半水生植物Rumex maritimus（R. maritimus）和Poly属水pi（P. hydropiper）产生了负面影响，并有利于陆上物种Leonurus heterophyllus（L heterophyllus）。关于对鱼类Spinibarbus hollandi（S. hollandi）的影响，结果表明，水的释放增加了产卵条件的适应性，特别是在潮湿和干燥的年份，但对越冬条件的影响很小。

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