小浪底水库运用情况分析

Analysis on Operation of the Xiaolangdi Reservoir

对小浪底水库下闸蓄水至2005年的运用情况进行了分析,并将运用效果与设计成果进行了对比,结论认为:①水库自投入运用至今均处于拦沙初期运用阶段;②水库运用以来,干流淤积三角洲顶点位置随着库水位的变化逐步向下游推进;③库区淤积形态与设计淤积形态相比,总体看来淤积部位偏上游,但未侵占长期有效库容;④库区泥沙主要以异重流形式输移,排沙比与设计成果基本一致;⑤从目前支流纵剖面形态看,各支流均未形成明显的拦门沙坎,随着库区淤积量的不断增加及运用方式的调整,拦门沙将逐渐显现。建议今后加强对支流纵剖面、异重流倒灌和水库冲刷的观测,对支流拦门沙的形成及发展演变机理进行专题研究。

The paper analyzes the operation of the Xiaolangdi Reservoir storage since 2005 and contrasts the operational effect with design. It concludes that a) from putting into operation to now is the initial operational stage of debris-retaining; b) since the operation, the top location of the delta is moved towards the downstream along with the variation of the reservoir level; c) comparing the sedimentation form of the reservoir area with that of design, generally the position of sedimentation is on the upper stream side, but not occupies the long term active storage; d) the reservoir sediment is mainly transported in the form of a density current and the sediment delivery rate is almost the same as that of design and; e) viewing from the present morphology of longitudinal profile of tributaries, each tributary has not formed an obvious sand barrier and the sand barrier will be formed along with the continuous increase of sedimentation volume and the regulation of operational mode. It suggests strengthening the observation on longitudinal profile of tributaries, downdraft of a density current and reservoir scour and fill and conducting a monographic study on the formation of sandbars and its development and evolution mechanism of tributaries.