基于RVA法的河流生态基流过程研究

发布时间：2019-04-02 03:52

【摘要】：针对我国目前生态需水量研究难以反映河流水文情势自然涨落变化的问题,从河流水文情势的整体角度出发,采用IHA法分析了金沙江上游岗托至巴塘河段的天然水文情势特征,得到了该河段各指标的RVA阈值范围。在总结前人研究的基础上,对计算河流生态基流量的RVA法进行了改进,提出非汛期、汛前期和汛后期采用RVA目标差值的75%推荐河流生态基流量,主汛期采用RVA目标差值的50%推荐河流生态基流量。采用改进的RVA法计算了金沙江上游巴塘断面的生态基流过程,得到巴塘断面各月的生态基流量分别为39.5 m~3/s、42.5 m~3/s、33.0 m~3/s、74.2 m~3/s、124.4m~3/s、259.3 m~3/s、394.0 m~3/s、581.0 m~3/s、493.5 m~3/s、259.7 m~3/s、131.1 m~3/s、71.0 m~3/s,占相应多年月均流量的比例范围为14.0%~32.9%,并与Tennant法的结果进行了对比分析。结果表明,该方法能够更好地反映金沙江上游天然河流水文情势的动态变化特征,可为金沙江上游水电开发生态保护提供技术参考。
[Abstract]:In view of the problem that the study of ecological water demand in China is difficult to reflect the natural fluctuation and variation of river hydrological situation, this paper analyzes the characteristics of natural hydrological regime from the upper reaches of Jinsha River to Batang River by means of IHA method from the overall point of view of river hydrologic situation. The RVA threshold range of each index of the reach is obtained. On the basis of summarizing previous studies, the RVA method for calculating river ecological base discharge is improved. It is suggested that 75% of the difference of RVA target in non-flood season, pre-flood period and late flood season should be used to recommend river eco-base discharge. In the main flood season, 50% of the target difference of RVA is used to recommend the ecological base discharge of the river. The ecological base flow process of Batang cross section in the upper reaches of Jinsha River was calculated by improved RVA method. The monthly ecological base flow of Batang cross section was 39.5 m ~ (3), 42.5 m ~ (3), 33. 0 m ~ (3) ~ (3) and 74.2 m ~ (3) ~ (- 1), respectively. 124.4 m / 3, 259.3 m / 3, 394.0 m / 3, 581.0 m / 3, 493.5 m / 3, 259.7 m / 3, 131.1 m / 3, 71.0 m / 3, 124.4 m, 259.3 m / 3, 394.0 m / 3, 581.0 m / 3, 493.5 m / 3, 259.7 m / 3, 131.1 m / 3, 71.0 m / 3, The proportion of average monthly flow in corresponding years is 14.0% / 32.9%, and the results are compared with the results of Tennant method. The results show that the method can better reflect the dynamic change characteristics of the hydrological situation of the natural rivers in the upper reaches of the Jinsha River and can provide technical reference for ecological protection of hydropower development in the upper reaches of the Jinshajiang River.
【作者单位】：中国电建集团北京勘测设计研究院有限公司;四川大学水力学与山区河流开发保护国家重点实验室;辽宁省江河流域管理局;汉能控股集团有限公司;
【基金】：国家重点研发计划(2016YFC0401710) 国家自然科学基金项目(51379136,51479127)
【分类号】：TV213.4

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