Assessing the impacts of anthropogenic drainage structures on hydrologic connectivity using high‐resolution digital elevation models
Assessing the impacts of anthropogenic drainage structures on hydrologic connectivity using high‐resolution digital elevation models
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DOI：
10.1111/tgis.12832
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发表时间：
2021-08
影响因子：
2.4
通讯作者：
S. Bhadra;Ruopu Li;Di Wu;Guangxing Wang;Banafsheh Rekabdar
中科院分区：
文献类型：
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作者：
S. Bhadra;Ruopu Li;Di Wu;Guangxing Wang;Banafsheh Rekabdar
使用数字高程模型描绘精确的流线是坡面流建模的关键步骤。然而，从高分辨率数字高程模型（HRDEM）中提取地表流线可能存在偏差，部分原因是缺乏有关桥梁和涵洞等人为排水结构（ADS）位置的信息。如果没有ADS，道路可能会成为“数字大坝”，阻碍流线的准确描绘。然而，目前还不清楚基于地形的水文模型的哪些变量可以用来减轻“数字大坝”的影响。本研究评估了ADS的位置，空间分辨率，抑郁症的处理方法和流向算法的影响，在内布拉斯加州的农业景观水文连通性。根据模拟排水交叉口和道路上实际ADS之间的偏移距离进行评估。结果表明：（a）在农业景观中，与D8或D-Infinity流向算法相结合的水流燃烧是从HRDEM模拟地表流线的最佳选择;（B）发现增加HRDEM分辨率对于促进ADS位置附近的准确排水交叉具有重要意义;（c）D8和D-Infinity流向算法在ADS位置处产生类似的排水交叉模式。这项研究预计将导致改进的参数设置HRDEM为基础的水文模拟。
Delineating accurate flowlines using digital elevation models is a critical step for overland flow modeling. However, extracting surface flowlines from high‐resolution digital elevation models (HRDEMs) can be biased, partly due to the absence of information on the locations of anthropogenic drainage structures (ADS) such as bridges and culverts. Without the ADS, the roads may act as “digital dams” that prevent accurate delineation of flowlines. However, it is unclear what variables for terrain‐based hydrologic modeling can be used to mitigate the effect of “digital dams.” This study assessed the impacts of ADS locations, spatial resolution, depression processing methods, and flow direction algorithms on hydrologic connectivity in an agrarian landscape of Nebraska. The assessment was conducted based on the offset distances between modeled drainage crossings and actual ADS on the road. Results suggested that: (a) stream burning in combination with the D8 or D‐Infinity flow direction algorithm is the best option for modeling surface flowlines from HRDEMs in an agrarian landscape; (b) increasing the HRDEM resolution was found significant for facilitating accurate drainage crossing near ADS locations; and (c) D8 and D‐Infinity flow direction algorithms resulted in similar patterns of drainage crossing at ADS locations. This research is expected to result in improved parameter settings for HRDEMs‐based hydrologic modeling.