刘家峡水电站坝前与洮河库区淤积发展趋势的分析计算

Calculation of Sedimentation in Tache Branch of Liujiaxia Reservoir and before Dam and Trend Analysis

刘家峡水库自1968年舌水到1991年底，库内共淤积泥沙12亿m3，占总库容的21％，威胁着电站的安全运行．本交通过实测资料分析并结合数学模型计算，对刘家峡水库的淤积发展趋势进行了分析．分析结呆表明：水库中泥沙的冲淤，取决于当年的进出库水沙条件、高水位高低及前期淤积状态等，其中洗河入库流量的大小时排河库区的冲淤起决定性作用．本文还就根本解决刘家峡水库泥沙问题的措施，提出了建议．

In the impounding period of 1968 to the end of 1991 a total amount 1. 2 billion m3consisting 21 % of the total reservior capacity of sediment was deposited in Liujiaxia Reservior. Itthreatens the normal operation of the power plant. In this paper, by combining analysis on fielddata and mathematic model, an estimation of the trend of the reservoir sedimentation has beenworked out. It is found that the deposition or erosion in a year depends on the incoming flow andsediment conditions, the stage in front of the dam in this year and the sedimentation situation before this year, etc. Among them the magnitude of the incoming discharge of Taohe river plays adominant role in the development of the sedimentation in Taohe region of the reservoir. Some proposals for dealing with sedimentation problems of the Liujiaxia Reservoir are put forward.