本文選題：三峽工程　切入點(diǎn)：變動(dòng)回水區(qū)　出處：《武漢大學(xué)學(xué)報(bào)(工學(xué)版)》2017年01期 　論文類型：期刊論文

【摘要】：變動(dòng)回水區(qū)河段的侵蝕基準(zhǔn)面在蓄水期抬升,在消落期和汛期逐漸恢復(fù)為天然狀態(tài),其沖淤調(diào)整特點(diǎn)不同于自然條件.以三峽庫(kù)區(qū)嘉陵江與長(zhǎng)江交匯河段為例,分析了175m試驗(yàn)性蓄水期前后交匯河段沖淤特性的變化.結(jié)果發(fā)現(xiàn),175m試驗(yàn)性蓄水以前,交匯河段由于上游來沙持續(xù)減少出現(xiàn)了累積性沖刷,175m試驗(yàn)性蓄水以后,侵蝕基準(zhǔn)面的抬升抑制了交匯河段的沖刷發(fā)展態(tài)勢(shì);其中支流嘉陵江來沙量減少的程度高于長(zhǎng)江干流以及2008-2012年汛期匯流比大于2003-2007年,使得嘉陵江支流河段繼續(xù)沖刷,而長(zhǎng)江干流河段轉(zhuǎn)為淤積.175m試驗(yàn)性蓄水前后交匯河段年內(nèi)汛淤枯沖的基本規(guī)律未變,但主要走沙期由汛后推遲到了次年的水位消落期,走沙量減少.
[Abstract]:The erosion datum level of the reach in the variable backwater area is uplifted during the water storage period and gradually restored to its natural state during the fall and flood periods, and the characteristics of its scouring and silting adjustment are different from those of the natural conditions. Taking the intersection of Jialing River and the Yangtze River in the three Gorges Reservoir area as an example, The characteristics of scour and deposition in the junction reach before and after the 175m experimental storage period are analyzed. The results show that before the 175m experimental impoundment, the cumulative scour erosion and 175m experimental impoundment occurred in the intersection reach due to the continuous reduction of upstream sediment. The uplift of erosion datum level has restrained the development trend of scour in the intersection reach, in which the amount of sediment coming from Jialing River is lower than that of the main stream of the Yangtze River and the ratio of runoff in flood season from 2008 to 2012 is larger than that of 2003-2007, which makes the tributaries of Jialing River continue to scour. However, the basic rules of flood and silt erosion in the junction reach before and after the experimental impoundment of 175m are not changed, but the main sediment transport period is postponed from the flood to the water level drop period of the following year, and the sediment transport volume decreases.
【作者單位】： 武漢大學(xué)水資源與水電工程科學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室;長(zhǎng)江科學(xué)院;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(編號(hào):51209016;10932012)
【分類號(hào)】：TV147

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