摘要
依据实测水沙资料研究了沁河下游水沙变化及对主槽断面形态的影响,分析了主槽下切对两岸引水及靠河险工的影响,并采用断面法和沙量平衡法对河道冲淤量进行了计算。结果表明:①进入沁河下游的多年平均水、沙量分别为11.2亿m3、504万t,汛期水、沙量分别占全年水、沙量的61.6%、94.4%,多年平均含沙量为4.5 kg/m3,近期来水来沙量呈递减趋势;②断面法计算的沁河下游多年平均淤积量为100万t,其中主槽淤积量占全断面淤积量的43%,伏背—丹河口、丹河口—武陟、武陟—沁河口河段的多年平均淤积量分别为3万、32万、65万t;③主槽深泓下切使得两岸引水困难、靠河工程根石外露,建议开展相关治理研究。
Based on the observed data of water and sediment, this paper studied the water and sediment variation in the downstream channel of the Qinhe River and the effect of that on sectional form of main channel. The effects of riverbed entrenchment of main channel on water diversion by both sides and that on dangerous anti - flood projects were analyzed. Scouring and deposition amount was calculated by section method. The results show：a） Annual average water and sediment amount entering into the lower Qinhe River is 1.12 billion m3 and 5.04 million tons respectively, and that of flood season account for 61.6% and 94.4% respectively. Annual average sediment concentration is 4.5 kg/m3 and the water and sediment amount had a descending trend in recent years, b） Annual average deposition amount in downstream channel of the Qinhe River is a million tons of which the deposition amount of main channel account for 43% of the full section＇ s deposition amount. Annual average deposition amount of the reach from Fubei to Danhe River estuary, and that of the reach from Danhe River estuary to Wuzhi, and that of the reach from Wuzhi to Qinhe River estuary is 30 thousand tons, 320 thousand tons and 650 thousand tons respectively, c）Water diversion by both sides becomes difficult and founda- tion stone is exposed because of riverbed entrenchment of main channel. Research on correlation treatment is suggested to be carried out.
出处
《人民黄河》
CAS
北大核心
2014年第1期39-41,64,共4页
Yellow River
关键词
水沙变化
断面形态变化
冲淤特性
沁河下游
water and sediment variation
sectional form variation
characteristics of scouring and deposition
Lower Qinhe River
