Investigating a floodplain scaling relation using a hydrogeomorphic delineation method
Investigating a floodplain scaling relation using a hydrogeomorphic delineation method
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DOI：
10.1029/2005wr004155
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发表时间：
2006-09-14
影响因子：
5.4
通讯作者：
Grimaldi, Salvatore
中科院分区：
文献类型：
--
作者：
Nardi, Fernando;Vivoni, Enrique R.;Grimaldi, Salvatore
洪泛区是重要的景观特征，在水文、地貌、地球化学和生态过程方面与邻近的高地有很大区别。因此，洪泛区研究的一个重要步骤是确定洪泛区的横向范围及其在流域内的变化。地形图绘制和基于GIS的分析的最新进展为开发确定洪泛区范围的自动化技术提供了一种手段。在这项研究中，我们提出了一个水文地貌洪泛区划定的联系简化的淹没算法与流域属性。我们利用该方法来调查洪泛平原形成的物理控制，如捕获的尺度关系洪泛平原宽度和贡献面积。我们的假设是，一个有效的划定接地水文地貌理论可以提高我们的理解河漫滩的几何形状在一系列的条件。我们测试两个不同的流域，潮湿的集水区在意大利和一个短暂的盆地在新墨西哥州的方法，并注意到存在的幂律缩放后，平均流命令的洪泛区宽度。进行算法参数的分析，以确定可能的限制。需要进一步的系统测试，以建立泛滩缩放和泛滩过程的控制的一般性。
Floodplains are critical landscape features that are highly distinguished from neighboring uplands in terms of their hydrologic, geomorphologic, biogeochemical, and ecological processes. Thus an essential step in floodplain studies is the determination of the lateral floodplain extent and its variability within a basin. Recent advances in topographic mapping and GIS-based analysis provide a means for developing automated techniques to determine floodplain extent. In this study, we propose a hydrogeomorphic floodplain delineation which links a simplified inundation algorithm with the river basin properties. We utilize the method to investigate the physical controls on floodplain formation, as captured by scaling relations between floodplain width and contributing area. Our hypothesis is that an efficient delineation grounded in hydrogeomorphic theory can improve our understanding of floodplain geometry across a range of conditions. We test the method for two distinct watersheds, a humid catchment in Italy and an ephemeral basin in New Mexico, and note the existence of power law scaling of the floodplain width after averaging over stream orders. An analysis of the algorithm parameters is conducted to identify possible limitations. Further systematic tests are needed to establish the generality of the floodplain scaling and its control on floodplain processes.