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首页> 外文会议>Hydropower 2006 International Conference >IMPACT ASSESSMENT OF THE LIUJIAXIA DAM OPERATION ONTHE FLOW REGIME OF THE LANZHOU REACH IN THE UPPERYELLOW RIVER
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IMPACT ASSESSMENT OF THE LIUJIAXIA DAM OPERATION ONTHE FLOW REGIME OF THE LANZHOU REACH IN THE UPPERYELLOW RIVER

机译：刘家峡大坝作业对上游黄河兰州段径流规律的影响评价。

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There are several constructed dams such as Qingtongxia, Liujiaxia, Qingtongxia, etc.On the main trunk of the Upper Yellow River. After the Liujiaxia dam operation, the naturalflow regime of Lanzhou reaches has been altered. In order to assess degree of the alteration ofthe natural flow regime, the RVA method and the hydrological series of daily mean flow rate atLanzhou Station from 1935 to 2001 are used to analyze the alteration of 33 ecologicallyrelevant hydrologic parameters (IHAs). The management objective based on RVA is not tohave the river attain the target range every year; rather, it is to attain the target range at thesame frequency as occurred in the natural or pre-development flow regime. In the analysis, the25th and 75th percentile values of each hydrologic parameter are used as RVA boundariescomputed from pre-dam hydrological series. The range of each parameter is divided into threecategories: high, middle and low. The middle category is defined as management target, that is,the attainment of RVA target of a particular parameter would be expected in only 50% years.The degree to which the RVA target is not attained (a measure of hydrologic alteration) iscomputed. The degree values of all of 33 IHAs are used to assess the degree of overallalteration. The result shows that the natural flow regime has been influenced by the operationof Liujiaxia dam and the alteration belongs to overall high alteration. In the 33 IHAs, 14parameters such as the mean flow rate of August, September, October, December, January,March and June, 90-day minimum flow rates, base flow, low flow pulse count, low flow pulseduration, rising rate, falling rate and number of reversals belong to high alteration. Theecological integrity of river ecosystems depends on their natural dynamic character. Viewingfrom maintaining the ecological integrity of Yellow River ecosystems, hydropower stationoperation must regard maintaining the natural flow regime bellow its dam in the range of itsvariability as its water management target, should design and implement an adaptivemanagement program to facilitate ecologically sustainable water management for the longterm.
机译：青铜峡，刘家峡，青铜峡等已建成水坝。 在黄河上游主干线上。刘家峡大坝运行后，自然 兰州河段的流域已经改变。为了评估变化的程度 时的自然流量状态，RVA方法和日平均流量的水文序列 利用1935年至2001年的兰州站分析了33个生态系统的变化。 相关的水文参数（IHA）。基于RVA的管理目标不是 每年使河流达到目标范围;而是要达到目标范围 与自然流动或开发前流动状态中发生的频率相同。在分析中， 每个水文参数的第25个百分位值和第75个百分位值被用作RVA边界 根据大坝前水文序列计算得出。每个参数的范围分为三个 类别：高，中，低。中间类别定义为管理目标，即 仅在50％的年内就可以达到特定参数的RVA目标。 未达到RVA目标的程度（衡量水文变化的程度）为 计算的。所有33个IHA的度值均用于评估总体IHA的度 改造。结果表明，自然流态受到了操作的影响。 刘家峡大坝的水位变化属于整体高位变化。在33个IHA中，有14个 参数，例如8月，9月，10月，12月，1月的平均流速， 3月和6月，最低流量90天，基本流量，低流量脉冲计数，低流量脉冲 持续时间，上升率，下降率和反转次数属于高变动。这 河流生态系统的生态完整性取决于其自然动态特性。观看中 从维护黄河生态系统，水电站的生态完整性 运营必须考虑在其水坝范围内保持自然流态 可变性作为其水管理目标，应设计并实施适应性强的 长期促进生态可持续水管理的管理计划 学期。

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