论文部分内容阅读
一、多沙河流水库淤积和河流泥沙一般概况我国北方地区的河流,由于流域内气象水文、地质地貌、农业水利的开发等因素的影响,水土流失严重,使河流挟带大量含有一定数量细颗粒、具有肥力的泥沙。以举世闻名的黄河为例:全长4850公里,年输沙量河口镇为1.5亿吨,至三门峡站达16亿吨;年平均含沙量37.6公斤/立米;最大含沙量高达620公斤/立米,而其分布又是极不均匀的:龙门站汛期水量占60%,沙量占80%,多沙年达90%以上;汛期沙量主要集中于7、8月间的几
First, the Duoshahe reservoir siltation and river sediment general situation In northern China, the river due to meteorological hydrology, geology and geomorphology, agricultural development and other factors, the serious soil erosion, so that a large number of river entrainment with a certain amount of fine Particles, fertile sediment. Take the world famous Yellow River as an example: a total length of 4850 kilometers, the annual sediment discharge of Hekou Town is 150 million tons, to Sanmenxia Station reached 1.6 billion tons; the average annual sediment concentration of 37.6 kg / m3; the maximum sediment concentration of up to 620 kg / While its distribution is extremely uneven: floodgate floodgate water accounted for 60% of the sand accounted for 80%, more than 90% of the sand years; flood season sand is mainly concentrated in July and August between a few