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平原区产汇流模拟
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摘要
平原河网地区因其地位的重要性、洪涝灾害的频发性及其损失的严重性,使得平原河网地区的产汇流模拟受到越来越多人的关注;因为平原地区产流规律的特殊性,实测资料缺乏,计算结果难以直接检验等,这些理论、技术上的困难使得平原河网地区的产汇流模拟成为水文模拟中的难点。本文将平原河网地区分为水面、水田、旱地和城镇四种下垫面,不同的下垫面按照不同的机制产流。
     本文在前人所做的平原河网地区产汇流模拟机制研究的基础上,对旱地的产流机制进行了新的探索,旨在克服新安江三层蒸发模型与潜水蒸发概念不符的缺点,将平原河网地区的产汇流模拟与地下水位建立了联系,以地下水位是否符合实测值检验模型产流计算的合理性;并对水田渗漏和灌溉渗漏的去处提出了新的想法。以太湖流域的嘉兴和欤城为例,分别计算了同时具有实测的降雨、蒸发和仅具有实测的降雨、需要移用蒸发资料的情况下单点的产流;并将本文所述方法和以前采用的平原区产汇流计算方法在相同计算条件下得到的净雨深进行了对比。
The runoff yield and concentration simulation of river net region in the plain was paid more and more attention because of the positional importance, the frequent flood and waterlog disasters, the serious loss etc. The runoff yield and concentration simulation of river net region in the plain had became the difficulty of the hydrological simulation because of some theoretic and technical difficulties that the law of the runoff yield in the plain is especial, measuring data is lacked, the computational result is difficult to examine directly etc. This paper classifieds the underlying surfaces of the plain area into four kinds that water surface, paddy field, arid land, cities and construction used land.
     On the basis of that anterior persons have had done about the research of runoff yield and concentration simulation mechanism of river net region in the plain, aiming to conquer the disadvantage that Xin Anjiang three layers evaporation was inconsistent with the concept of dive evaporation, this paper had searched after the runoff yield mechanism for arid land, connected the runoff yield and concentration simulation of river net region in the plain with water table, tested the rationality of the model computational result by the criterion whether computational water level tallied with measuring data, and putted forward new idea about leakage of the paddy field and the irrigation. Taking Jia Xing and Yu Cheng of Tai Lake basin for example, this paper had calculated respectively two states runoff yield for single site that have measuring rainfall and evaporation data at the same time and only have measuring rainfall data, need transplant evaporation data; contrasted computational runoff under the same computational condition by the method depicted in this paper with that of formerly adoptive method.
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