【摘要】：三峽工程蓄水以來,長江中游宜昌至大埠街這一沙卵石河段的河床持續(xù)沖刷下切,枯水同流量下水位逐步下降�；趯崪y資料,對枯水水位變化的原因進行研究,并就枯水水位下降對通航條件的影響進行分析。認為:沙卵石河段內(nèi)的河床沖刷下切是枯水同流量下水位下降的主要原因,但河床粗化在一定程度上減小了水位下降幅度;隨著枯水水位的進一步下降,為確保葛洲壩船閘的正常運行,三峽工程枯水期調(diào)度壓力將逐步增加,且局部卵石淺灘的礙航問題也會日益突出。
[Abstract]:Since the water storage of the three Gorges Project, the bed of the sandy pebble section from Yichang to Dabu Street in the middle reaches of the Yangtze River has been continuously scoured and cut down, and the water level at the same flow rate has gradually decreased. Based on the measured data, the causes of the variation of the low water level are studied, and the influence of the low water level on the navigable conditions is analyzed. It is considered that the scouring and cutting of the river bed in the sandy pebble reach is the main reason for the decrease of the water level at the same flow rate, but the coarsening of the river bed reduces the water level to a certain extent, and with the further decrease of the low water level, In order to ensure the normal operation of Gezhouba shiplock, the dispatching pressure of the three Gorges Project will increase gradually during the dry season, and the problem of hindering navigation in the local pebble shoals will become increasingly prominent.
【作者單位】： 長江航道規(guī)劃設計研究院;
【分類號】：U612.23

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