中线南水北调穿黄渡槽槽位选择

Decision Making on Choosing the Position of Aqueduct Bridge of Drawing Water From the Yangtze River into the Yellow River through the Middle Lin

穿黄渡槽是中线南水北调工程中规模最大的跨河建筑物，技术难度高，涉及面广。除满足连接两岸输水总干渠的要求外，还应从黄河治理、河势及渡槽本身的技术经济指标等方面进行综合比较，而槽位选择则和以上诸方面密切相关。本文根据穿黄河段的实测资料，分析了河势演变特点，并对小浪底水库投入运用前、后穿黄河段河势的发展趋势作了预估，在此基础上，从河势、工程量及穿黄渡槽可能给黄河造成的影响等方面对三条不同的槽位线路进行了比选。结果表明，所选的李村一陈家沟线能较好地协调穿黄渡槽与黄河诸方面的关系，同时，也为其本身节减工程量、降低投资创造了条件。

The aqueduct bridge across the Yellow River is the largest across river constructure of the project of drawing the water from the Yangtze River into the Yellow River,which is of the characters of high technic difficulty and relative to a lot of aspects. Besides to meet the requirement of connecting the main channel on both the river sides, it should be compared comprehensively in the view of the Yellow River regulation,river regime,technical and economic indices of the aqueduct bridge itself,and others, and choosing position of the aqueduct bridge is closely relative to the mentioned aspects. Based on the experimental records of the corresponding river reaches,the river regime development is analyzed in the paper, the developing trend for the reaches before and after Xiaolangdi reservior string operahon is estimated, and then, three position for the aqueduct bridge line are compared in the aspects of river regime,project quantity and the influence to the Yellow River.The choosing results indicated that the selected line of Licun to Chenjiagou is able to coordinate the relations between the aqueduct bridge and these aspects of the Yellow River, at the same time,it will create the condihons to decrease project quantity and deduct investment.