溫中壩河段卵石輸移規(guī)律與航道治理對策研究
發(fā)布時間:2019-04-04 19:58
【摘要】:長江上游地區(qū)蘊藏著投資與開發(fā)的巨大潛力,是西部開發(fā)的重點區(qū)域。長江上游溫中壩河段作為長江上游干流航道的重要組成部分,起著承上啟下的重要作用。該水道目前航道等級為Ⅲ級,按Ⅱ級航道標準,不滿足航道尺度要求的灘段有啞巴磧和溫中壩兩處礙航灘險。河段屬典型的山區(qū)河流,岸邊大小礁石隨處可見,地形十分復雜。因此研究溫中壩河段礙航特性和卵石輸移規(guī)律,開展整治方案的研究,對該河段的整治極為關鍵。本文以長江上游溫中壩河段為研究對象,搜集實測水文、地形資料,對溫中壩河段進行了歷年河床演變分析;建立了溫中壩河段1:100正態(tài)物理模型和平面二維數(shù)學模型,研究了溫中壩河段卵石輸移規(guī)律,并針對兩個礙航灘險各提出了兩種整治方案,得出以下結(jié)論:(1)通過河床演變分析得出:該河段河勢基本穩(wěn)定,年際間處于沖淤平衡狀態(tài)。深泓線的平面位置和高程變化除局部地方外,也大致保持一致。溫中壩灘險段由于近年來的采砂現(xiàn)象出現(xiàn)了大面積的采砂坑和沙堆區(qū)。(2)通過歷年實測地形資料,對多年來溫中壩卵石沖淤帶進行了區(qū)域性的劃分,繪制了多年卵石沖淤圖;通過定床輸沙試驗,掌握了不同流量下溫中壩河段卵石輸移帶分布規(guī)律。結(jié)合卵石輸移分布圖和表面流場分布,得到了不同灘險內(nèi)強、弱輸沙帶和卵石落淤區(qū)的流速大致分布規(guī)律。(3)結(jié)合定床水流試驗,掌握了溫中壩灘險和啞巴磧?yōu)╇U的礙航特征,據(jù)此每個灘險提出了兩個整治方案。分析比較測量數(shù)據(jù)和計算結(jié)果,比選得出溫中壩方案一和啞巴磧方案二為最佳方案。
[Abstract]:There is great potential for investment and development in the upper reaches of the Yangtze River, which is the key area for the development of the western region. As an important part of the main channel of the upper reaches of the Yangtze River, the Wenzhongba reach of the upper reaches of the Yangtze River plays an important role in linking the above to the next. At present, the channel grade of this channel is grade 鈪,
本文編號:2454117
[Abstract]:There is great potential for investment and development in the upper reaches of the Yangtze River, which is the key area for the development of the western region. As an important part of the main channel of the upper reaches of the Yangtze River, the Wenzhongba reach of the upper reaches of the Yangtze River plays an important role in linking the above to the next. At present, the channel grade of this channel is grade 鈪,
本文編號:2454117
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