The construction of reservoirs for water supply alters the riverine ecology and changes water quality. It is, therefore, imperative to estimate and provide the riverine environmental flow requirement to prevent irreversible environmental damage and to maintain suitable water quality. Water releases from reservoirs constitute the means for meeting environmental flow and water quality requirements downstream from reservoirs. These requirements can be realized through the modification of the reservoir operation programmes by reallocating a percentage of the reservoir releases otherwise dedicated to quantitative objectives. This is performed in this study by considering the qualitative (i.e. pertaining to water quality) objectives alongside quantitative objectives of reservoir releases in order to achieve a general coverage for an operating programme that balances in the most rational manner the interests of riverine environmental protection and quantitative functions. The case study area is located in the river reach between the Gotvand reservoir and Shooshtar city in the Gotvand‐Karoon reservoir‐river system in Iran. The range of riverine environmental flow is calculated in the study river reach with hydrologic methods. Water quality is simulated and included reservoir operation with the QUAL‐2K simulation model. The existing quantitative and qualitative objectives for reservoir operation are determined and classified. The best reservoir releases corresponding to three scenarios are determined by the Nash theory considering all possible objectives in the reservoir‐river system. These scenarios allocate relative weights to defined objectives and releases were determined to be equal to 183.8, 141.8 and 206.8 m³/s for three scenarios.

中文翻译：

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实现河流环境流量：将纳什理论应用于水库运营中的定性和定量冲突解决

供水水库的建设改变了河流生态，改变了水质。因此，必须估算并提供河流环境流量要求，以防止不可逆转的环境破坏并保持适当的水质。从水库释放的水构成满足水库下游环境流量和水质要求的手段。这些要求可以通过修改油藏作业程序来实现，方法是重新分配一定比例的油藏排放量，否则这些油藏专门用于定量目标。在本研究中，通过考虑定性（即 与水质有关的目标）以及水库排放的定量目标，以实现对运营计划的全面覆盖，从而以最合理的方式平衡河流环境保护和定量功能的利益。案例研究区域位于伊朗Gotvand-Karoon水库-河流系统的Gotvand水库和Shooshtar市之间的河段。用水文方法计算研究河段中河流环境流量的范围。对水质进行了模拟，并通过QUAL-2K模拟模型将其包括在水库运行中。确定并分类了水库运行的现有定量和定性目标。纳什理论根据考虑储层-河流系统中所有可能目标的情况，确定了对应于三种情景的最佳储层释放量。这些方案将相对权重分配给已定义的目标，并确定释放量等于183.8、141.8和206.8 m三种情况下为³ / s。