土桥水道碍航特性突变分析

发布时间：2018-06-25 07:38

本文选题：土桥水道 + 碍航特性　；参考：《水运工程》2017年02期

【摘要】：长江下游土桥水道自1998年开始航道条件恶化,但不同时期碍航特性不同。以1955—2014年土桥水道的实测地形、水文资料及大通站水沙资料为基础,用有序聚类法分析了大通站输沙量的变化特点,以及各类碍航特性变化的原因。结果表明:目前土桥水道碍航特性已从断面形态宽浅及淤沙碍航变为左汊分流比下降,其主要原因是三峡蓄水后大通站水沙过程的变化。该水沙过程不利于左汊分流比的维持,特别是175 m蓄水方案运行后,左汊分流比明显下降,成为影响航道条件的主要因素。
[Abstract]:The channel conditions of the earth bridge in the lower reaches of the Yangtze River have deteriorated since 1998, but the characteristics of hindrance are different in different periods. Based on the measured topography, hydrological data and water and sediment data of Tuqiao waterway from 1955 to 2014, the variation characteristics of sediment transport in Datong station and the reasons for the change of various characteristics of hindrance to navigation are analyzed by using the ordered clustering method. The results show that the characteristics of the earth bridge waterway have changed from broad and shallow section shape and silt to left branch diversion ratio, which is mainly due to the change of water and sediment process in Datong station after the three Gorges impoundment. The process of water and sediment is not conducive to the maintenance of the distribution ratio of the left branch, especially after the operation of the 175m storage scheme, the distribution ratio of the left branch decreases obviously, which becomes the main factor affecting the waterway condition.
【作者单位】：武汉大学水资源与水电工程科学国家重点实验室;长江航道规划设计研究院;长江航道测量中心;
【基金】：中央高校基本科研业务费专项资金(2042016kf1068)
【分类号】：U617

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