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以某地城河河网为例,根据水质改善目标与河网水力特征、调蓄能力,从技术、经济两方面综合考虑,提出了“间断引水”和“连续引水”两种方案。针对间断引水方案,分别计算了不同特征水位和不同水质改善目标条件下的首次引水流量、首次引水之后的水质维持时间和第二次及以后各次的引水流量。针对连续引水方案,分别计算了不同水质改善目标条件下、不同特征水位时的最小引水流量。根据调入流量的大小不同,从提高河网水动力特性入手,提出了“同时配水”与“轮流配水”两种方案。在保证调水配水安全的同时,根据来水量的具体情况,通过调水方案与配水方案的有机组合,最大限度地发挥调水配水改善水环境的功用。
Taking a city river network as an example, according to the water quality improvement target and the river network hydraulic characteristics and the storage capacity, from the technical and economic aspects, we put forward two proposals of “intermittent diversion” and “continuous diversion” Program. According to the scheme of intermittent water diversion, the initial water diversion flow rate, the water quality maintenance time after the first water diversion and the water diversion flow rate of the second and subsequent times under different water level and water quality improvement targets were calculated. According to the scheme of continuous water diversion, the minimum water diversion flow rate under different water quality improvement targets was calculated respectively. According to the difference of the incoming flow rate, two schemes of “simultaneous water distribution” and “alternate water distribution” are put forward to improve the hydrodynamic characteristics of the river network. While ensuring the safety of water diversion and distribution, according to the specific circumstances of water supply, through the organic combination of water diversion scheme and water distribution scheme, the function of water diversion and water distribution to improve water environment is maximized.