%0 Journal Article
%T Identifying and Modeling Confined Hydrological Processes in Plain Polders<br>基于SWAT的平原圩区受控水文过程识别和模拟
%A LUO Yunxiang
%A SU Baolin
%A ZHANG Qian
%A YANG Wuzhi
%A <br>罗运祥
%A 苏保林
%A 张倩
%A 杨武志
%J 资源科学
%D 2013
%I 
%X The plain polders are characterized by flat topography, low hydraulic gradients, and controlled hydrological processes. Hydrological connection between the inside polder area and the receiving water body is confined by the water control facilities. The plain polders are often highly regulated, which may change and add up to the complexity of hydrological processes such as production and concentration. SWAT is a physically based, distributed model, which can simulate rain-runoff process, sediment and nutrient transport in watersheds with complex land use, soil and management. However, hydrological processes are usually modeled as free discharge processes, which is not applicable in plain polders. In addition, watershed delineation cannot be simply accomplished without considering anthropogenic land cover features (i.e. dykes, sluices, and roads), which will affect runoff processes. As the dykes and sluices segment the whole polder into several independent catchment units, it is proposed to model the hydrological processes separately for each catchment unit, which makes the modeled process agree with the real routing process affected by dykes. As runoff is usually routed through the ditches to the nearby pumping station and pumped out under control, it is proposed to model the hydrologic processes with multiple outlets, which can make the modeled process agree with the realistic one. River network and anthropogenic land cover features (i.e. dykes, sluices, and roads) were incorporated into the DEM to make the watershed delineation agree with the realistic flow direction and accumulation process. The reservoir, which acts as the impoundment of pump station, was added to model the confined drainage processes. The results show that these watershed delineation techniques can simulate the manually-controlled and complicated hydrological processes in plain polders. Scenario analysis showed that the outflow of confined process was slightly lower than the free-discharge process under the same conditions, indicating the retention effect of runoff in the pump station. The water body of the pump station can store runoff until water exceeds the target volume. During this process, the hydrologic residue time is increased compared to the free-discharge process, increasing the time of water-lose processes such as infiltration and evaporation. After adding a reservoir to control the drainage process, there is little or no outflow in the confined process during the dry season, in accordance with the observed drainage process.
%K Polder area
%K SWAT model
%K Enhanced watershed delineation
%K Controlled hydrological processes<br>平原圩区
%K SWAT模型
%K 强化流域提取
%K 受控水文过程
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=B5EDD921F3D863E289B22F36E70174A7007B5F5E43D63598017D41BB67247657&cid=B47B31F6349F979B&jid=9DEEAF23637E6E9539AD99BE6ABAB2B3&aid=D096FE55569F280199AB65C2D4FE1FAD&yid=FF7AA908D58E97FA&vid=6209D9E8050195F5&iid=38B194292C032A66&sid=65FC738C50B41E43&eid=1D5555D0B4345CA8&journal_id=1007-7588&journal_name=资源科学&referenced_num=0&reference_num=18