不同生态基流量对拉洛水利枢纽发电损益影响分析

在中长期水库优化调度中,为了研究不同生态基流对水利枢纽发电效益影响,探索进一步加大生态基流的可能性,论文提出生态发电收益损失比值k,以分析比较不同生态基流下的发电收益损失。以西藏拉洛水利枢纽作为实例,通过水文学方法计算拉洛下游生态基流,计算满足灌溉用水约束和生态基流约束的水库优化调度结果。在此基础上,逐步增大生态基流量,计算不同生态基流下的生态发电收益损失比。研究结果表明,可进一步加大拉洛水利枢纽生态基流,使单位生态水量的发电收益相对损失最小。

Impact of ecological base flow on power revenues and losses of Laluo hydro-junction

This paper describes a ratio of power revenue losses to ecological benefits for assessment of the losses in the power generation revenues of a reservoir, considering the constraint of different ecological base flows in its medium and long-term optimal operation. This ratio parameter can be used for examining the impact of ecological base flow on the revenue and exploring the possibility of increasing ecological base flow in practice. In a case study of the Laluo hydro-junction in Tibet, we calculated the ecological base flows of its lower reach using a hydrologic method, and developed new schemes for optimal reservoir scheduling under the constraint of irrigation and ecological water demands. In the new schemes the ecological base flow was increased by various amounts, and the ratios of power revenue loss to ecological benefit calculated. Results show that in the Laluo case, it is feasible to increase the ecological base flow and this measure can minimize the relative losses in generation benefits per unit volume of ecological water.