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首页> 外文期刊>Hydrological ProcHydrological Processesrnesses >Watershed delineation using hydrographic features and a DEM in plain river network region
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Watershed delineation using hydrographic features and a DEM in plain river network region

机译：平原河网地区利用水文特征和DEM进行流域划分

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摘要

Watershed delineation is a required step when conducting any spatially distributed hydrological modelling. Automated approaches are often proposed to delineate a watershed based on a river network extracted from the digital elevation model (DEM) using the deterministic eight-neighbour (D8) method. However, a realistic river network cannot be derived from conventional DEM processing methods for a large flat area with a complex network of rivers, lakes, reservoirs, and polders, referred to as a plain river network region (PRNR). In this study, a new approach, which uses both hydrographic features and DEM, has been developed to address the problems of watershed delineation in PRNR. It extracts the river nodes and determines the flow directions of the river network based on a vector-based hydrographic feature data model. The river network, lakes, reservoirs, and polders are then used to modify the flow directions of grid cells determined by D8 approach. The watershed is eventually delineated into four types of catchments including lakes, reservoirs, polders, and overland catchments based on the flow direction matrix and the location of river nodes. Multiple flow directions of grid cells are represented using a multi-direction encoding method, and multiple outflows of catchments are also reflected in the topology of catchments. The proposed approach is applied to the western Taihu watershed in China. Comparisons between the results obtained from the D8 approach, the ‘stream burning’ approach, and those from the proposed approach clearly demonstrate an improvement of the new approach over the conventional approaches. This approach will benefit the development of distributed hydrological models in PRNR for the consideration of different types and multiple inlets and outlets of catchments. Copyright © 2015 John Wiley & Sons, Ltd.
机译：在进行任何空间分布的水文建模时，流域划分是必需的步骤。经常提出自动方法来使用确定性八邻域（D8）方法基于从数字高程模型（DEM）中提取的河网来描绘流域。但是，对于具有河流，湖泊，水库和田等复杂网络的大面积平坦区域，称为常规河网区域（PRNR），不能从常规DEM处理方法中得出真实的河网。在这项研究中，已经开发了一种同时使用水文特征和DEM的新方法来解决PRNR中流域划界的问题。它基于基于矢量的水文特征数据模型提取河流节点并确定河流网络的流向。然后使用河网，湖泊，水库和来修改由D8方法确定的网格单元的流动方向。根据流向矩阵和河流节点的位置，最终将该流域划分为四种集水区，包括湖泊，水库，田和陆上集水区。网格单元的多个流向使用多方向编码方法表示，流域的拓扑结构中也反映了流域的多个流出。该方法适用于中国西部的太湖流域。 D8方法，“流燃烧”方法与提议方法的结果之间的比较清楚地表明，新方法比传统方法有所改进。考虑到不同类型以及集水区的多个入口和出口，该方法将有利于PRNR中分布式水文模型的开发。版权所有©2015 John Wiley＆Sons，Ltd.

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  • 来源
    《Hydrological ProcHydrological Processesrnesses》 |2016年第2期|276-288|共13页
  • 作者

    Lai Zhengqing; Li Shuo; Lv Guonian; Pan Zhirong; Fei Guosong;

  • 作者单位

    Nanjing Normal University Key Laboratory of Virtual Geographic Environment Ministry of Education Nanjing China;

    State Key Laboratory Cultivation Base of Geographical Environment Evolution (Jiangsu Province) Nanjing China;

    Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing China;

    Nanjing Normal University Key Laboratory of Virtual Geographic Environment Ministry of Education Nanjing China;

    State Key Laboratory Cultivation Base of Geographical Environment Evolution (Jiangsu Province) Nanjing China;

    Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing China;

    Nanjing Normal University Key Laboratory of Virtual Geographic Environment Ministry of Education Nanjing China;

    State Key Laboratory Cultivation Base of Geographical Environment Evolution (Jiangsu Province) Nanjing China;

    Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application Nanjing China;

    Water Conservancy Bureau of Liyang Liyang China;

    Water Conservancy Bureau of Liyang Liyang China;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    watershed delineation; plain river network region; hydrographic feature; data model; DEM;

    机译：流域划定平原河网区水文特征数据模型DEM;

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