基于多目标的河流生态需水阈值研究

The Research on River Ecological Water Requirement Threshold Based on Multiple Objectives

选取了水生生物保护、河流输沙、河流自净作为河流生态系统健康运行的生态目标,进行多目标下的河流生态需水阈值研究,结合变异性范围法(RVA)进行比较验证。以西安市灞河为实例进行分析,从维护河流生态系统整体功能健康的角度出发,确定河流生态需水阈值为1.43×108m3,占灞河多年平均地表径流总量4.9×108m3的29.2%,RVA法计算结果为1.49×108m3,占灞河多年平均地表径流总量的30.41%,与计算结果吻合。

This papar selects the protection of aquatic organisms,river sediment transportation,river self-purification as the ecological objectives of healthy operation of the river ecosystem to study the multi-objective river ecological water demand threshold,with the range of variability approach（RVA） to carry out comparative verification.With the Bahe River in Xi＇an as the actual example to carry out the analysis and as viewed from the healthy whole function of preserving the river ecosystem,the river ecological water requirement threshold determined should be 1.43×108 m3,accounting for 29.2% of the Bahe river＇s yearly mean total surface runoff（4.9×108 m3） for years.The results calculated by RVA method is 1.49×108 m3,accounting for 30.41% of the Bahe River＇ yearly mean total surface runoff,being in coincidence with the calculated result.