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洛河是陕西境内黄河的一条支流,也是我国北方多泥沙河流之一。人民引洛渠灌区位于洛河下游,引用洛河水浇灌农田。洛河流经陕北山原地区,每年夏秋,暴雨发洪,洛河含沙量过大,不能引水灌溉;加之泥沙多年沉积河床,造成下游河床抬高,淹没洛河两岸大量耕地,造成水害。据洛河下游固市水文站自一九三三年以来的记载资料统计,汛期最高含沙量达70%左右,多年平均输沙量年为9700万吨。每年夏灌,洛河含沙量超过15%(重量比)渠首关闸停水。因此,每年在夏灌用水紧张时期,约有十五天左右因含沙量超限不能引水,少引水一千万立米左右,约占可能引水量的20%,加剧了棉、秋用水的供需矛盾。为了解决
Luohe is a tributary of the Yellow River in Shaanxi Province and one of the many sediment rivers in northern China. The People’s Republic of China cited that the Luoqu Canal Irrigation District is located in the lower reaches of the Luohe River and refers to the irrigated farmland of Luohe River. Luo River flows through the mountainous areas of northern Shaanxi. Each summer and autumn, heavy rainfall floods flood the Luohe River and lead to irrational irrigation. Combined with sediment deposition for many years, the lower reaches of the riverbed is raised and a large amount of arable land is flooded across the Luohe River, causing water damage. According to statistics of the downstream hydrological station in Luo River since 1933, the maximum sediment concentration reached about 70% during the flood season and the annual average sediment transport volume was 97 million tons. Annual summer irrigation, Luohe sediment concentration of more than 15% (by weight) at the gates shut gates. Therefore, during the summer irrigation water shortage period, about 15 days due to excessive sediment concentration can not lead to water, less water diversion about 10 million cubic meters, accounting for about 20% of the possible water diversion, exacerbated the supply of cotton and autumn water supply and demand contradiction. In order to solve