本文選題：黃河 + 辮狀河段�。� 參考：《水土保持研究》2017年03期

【摘要】：心灘作為辮狀河道最主要的微地貌特征,其變化特征的研究對(duì)于理解辮狀河道的演變具有重要意義。以黃河臨河段213km長(zhǎng)的辮狀河道為研究對(duì)象,基于1988—2013年的遙感圖像繪制了相應(yīng)日期的河道平面形態(tài)圖,分析了該河段心灘數(shù)量和心灘面積變化;利用2013年內(nèi)6幅河道平面圖建立了心灘面積與巴彥高勒站水位之間的線性關(guān)系式,利用該關(guān)系式求取了其他年份1 050m參考水位下的心灘面積并進(jìn)行心灘沖淤變化對(duì)比。結(jié)果表明:黃河臨河段心灘總個(gè)數(shù)、心灘總面積、心灘平均面積、中位數(shù)心灘面積和最大心灘面積總體上都具有減小的趨勢(shì)。在1 050m參考水位下,黃河臨河段心灘面積在1988—2013年具有不同的沖淤變化特征,其中在2000年以前的變化幅度大,趨勢(shì)不明顯,2000年以后則分布較為集中,且有減小的趨勢(shì),并在1990—2000年大幅減小。在龍羊峽、劉家峽等水庫(kù)運(yùn)行影響下汛期黃河臨河段水量和輸沙量占全年的比例在減小,年內(nèi)分配趨于均衡化,并且輸沙量的減幅要大于水量的減幅,這對(duì)于研究區(qū)心灘的沖淤有重要影響。同時(shí),上游流域來沙系數(shù)的變化也在一定程度上影響著該河段心灘的沖淤變化。
[Abstract]:As the main microgeomorphological feature of braided channel, the study of its variation is of great significance in understanding the evolution of braided channel. Taking the long braided channel of 213km in the Linhe section of the Yellow River as the research object, based on the remote sensing image from 1988 to 2013, the plane shape map of the corresponding date was drawn, and the quantity of the central beach and the area of the bank were analyzed. The linear relationship between Xintan area and Bayangol station water level was established by using six river channel plans in 2013, and the core beach area at 1050m reference water level in other years was calculated and compared. The results show that the total number, total area, average area, median area and maximum area of the heart beach in the Yellow River reach have a decreasing trend. Under the reference water level of 1 050m, the area of the core beach in the Linhe reach of the Yellow River has different characteristics of erosion and siltation from 1988 to 2013, in which the range of change is large before 2000, the trend is not obvious, and after 2000, the distribution is more concentrated and has the tendency of decreasing. And in 1990-2000 a sharp decrease. In Longyangxia, Liujiaxia and other reservoirs, the proportion of water and sediment discharge in the Linhe section of the Yellow River in flood season is decreasing, and the distribution of sediment in the whole year tends to be equalized, and the decrease of sediment discharge is larger than that of water quantity. This has an important effect on the erosion and siltation of the core beach in the study area. At the same time, the change of sediment coefficient in the upper reaches also affects the erosion and deposition of the core beach in the reach to some extent.
【作者單位】： 中國(guó)科學(xué)院地理科學(xué)與資源研究所陸地水循環(huán)及地表過程重點(diǎn)實(shí)驗(yàn)室;中國(guó)科學(xué)院大學(xué);
【基金】：國(guó)家自然科學(xué)基金(41271027,41571005) 國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃項(xiàng)目(2011CB403305)
【分類號(hào)】：TV882.1

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