针对中小型河流引水式水电站下游减脱水河段的生态修复问题,总结了5种常用的生态流量过程计算方法,将物元分析法(Matter Element Analysis)与Tennant法耦合,提出了ME-Tennant河流生态流量过程评价模型。以湖南省刘家坪水电站为例,应用...针对中小型河流引水式水电站下游减脱水河段的生态修复问题,总结了5种常用的生态流量过程计算方法,将物元分析法(Matter Element Analysis)与Tennant法耦合,提出了ME-Tennant河流生态流量过程评价模型。以湖南省刘家坪水电站为例,应用该模型对不同方法计算出来的生态流量过程进行评价,最终以NGPRP法和年内展布法的计算结果确定最小生态流量过程,以2种不同保证率下的逐月频率法计算结果确定适宜生态流量过程,结果符合研究流域的生态水文特征。研究为推求河道生态流量过程提供了新思路,也为水电站下游减脱水河段的生态修复提供了参考。展开更多
In arid regions, large-scale water diversion from rivers leads to significant changes in river flow regimes, which may have large impacts on ecological water uses of river-dependent ecosystems, such as river, lake, we...In arid regions, large-scale water diversion from rivers leads to significant changes in river flow regimes, which may have large impacts on ecological water uses of river-dependent ecosystems, such as river, lake, wetland, and riparian ecosystems. To assess the integrated impact of water diversion on ecological water uses, we proposed a hierarchy evaluation model composed of four layers representing the evaluation goal, sub-areas of the influenced region, evaluation criteria, and water diversion schemes, respectively. The evaluation criteria for different types of ecological water uses were proposed, and the analytical hierarchy process was used for the integrated assessment. For a river ecosystem, the percentage of mean annual flow was used to define the grade of environmental flow. For a lake ecosystem, water recharge to the lake to compensate the lake water losses was used to assess the ecological water use of a lake. The flooding level of the wetland and the groundwater level in the riparian plain were used to assess the wetland and riparian ecological water uses, respectively. The proposed model was applied to a basin in northern Xinjiang in northwest China, where both water diversion and inter-basin water transfer projects were planned to be carried out. Based on assessment results for the whole study area and two sub-areas, an appropriate scheme was recommended from four planning schemes. With the recommended scheme, ecological water uses of the influenced ecosystems can be maintained at an acceptable level. Meanwhile, economical water requirements can be met to a great extent.展开更多
文摘针对中小型河流引水式水电站下游减脱水河段的生态修复问题,总结了5种常用的生态流量过程计算方法,将物元分析法(Matter Element Analysis)与Tennant法耦合,提出了ME-Tennant河流生态流量过程评价模型。以湖南省刘家坪水电站为例,应用该模型对不同方法计算出来的生态流量过程进行评价,最终以NGPRP法和年内展布法的计算结果确定最小生态流量过程,以2种不同保证率下的逐月频率法计算结果确定适宜生态流量过程,结果符合研究流域的生态水文特征。研究为推求河道生态流量过程提供了新思路,也为水电站下游减脱水河段的生态修复提供了参考。
基金supported by the National Natural Science Foundation of China (Grant No. 50879041)
文摘In arid regions, large-scale water diversion from rivers leads to significant changes in river flow regimes, which may have large impacts on ecological water uses of river-dependent ecosystems, such as river, lake, wetland, and riparian ecosystems. To assess the integrated impact of water diversion on ecological water uses, we proposed a hierarchy evaluation model composed of four layers representing the evaluation goal, sub-areas of the influenced region, evaluation criteria, and water diversion schemes, respectively. The evaluation criteria for different types of ecological water uses were proposed, and the analytical hierarchy process was used for the integrated assessment. For a river ecosystem, the percentage of mean annual flow was used to define the grade of environmental flow. For a lake ecosystem, water recharge to the lake to compensate the lake water losses was used to assess the ecological water use of a lake. The flooding level of the wetland and the groundwater level in the riparian plain were used to assess the wetland and riparian ecological water uses, respectively. The proposed model was applied to a basin in northern Xinjiang in northwest China, where both water diversion and inter-basin water transfer projects were planned to be carried out. Based on assessment results for the whole study area and two sub-areas, an appropriate scheme was recommended from four planning schemes. With the recommended scheme, ecological water uses of the influenced ecosystems can be maintained at an acceptable level. Meanwhile, economical water requirements can be met to a great extent.
