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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Evolution of channel morphology and hydrologic response in an urbanizing drainage basin
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Evolution of channel morphology and hydrologic response in an urbanizing drainage basin

机译：城市化流域河道形态与水文响应演变

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The Dead Run catchment in Baltimore County, Maryland, has undergone intense urbanization since the late 1950s. Reconstruction of the channel planform from topographic maps dating back to the 1890s and aerial photographs dating back to the 1930s indicates that the channel has remained stable in planform since at least the 1930s. The relative stability of Dead Run contrasts with the alterations in channel morphology reported for other urbanizing streams in the Piedmont physiographic province of the eastern United States. Trend analyses of discharge records in Dead Run show that urban development and stormwater control measures have had significant impacts on the hydrologic response of the catchment. The flood hydraulics of the Dead Run catchment are examined for the event that occurred on 22 June 1972 in association with Hurricane Agnes. A two-dimensional hydraulic model, TELEMAC-2D, was used with a finite-element mesh constructed from a combination of high-resolution LiDAR topographic data and detailed field survey data to analyse the distribution of boundary shear stress and unit stream power along the channel and floodplain during flooding from Hurricane Agnes. The spatial and temporal distributions of these parameters, relative to channel gradient and channel/valley bottom geometry, provide valuable insights on the stability of the Dean Run channel. The stability of Dead Run's channel planform, in spite of extreme flooding and decades of urban development, is most likely linked to geological controls of channel and floodplain morphology. Copyright (c) 2006 John Wiley & Sons, Ltd.
机译：自1950年代后期以来，位于马里兰州巴尔的摩县的Dead Run流域经历了强烈的城市化进程。从可追溯到1890年代的地形图和可追溯到1930年代的航拍照片重建通道平面图，这表明该通道至少在1930年代就一直保持稳定。与美国东部的皮埃蒙特（Piedmont）地理学省的其他城市化河流报道的“河道决断”（Dead Run）的相对稳定性相反。 《荒漠》中排放记录的趋势分析表明，城市发展和雨水控制措施对流域的水文响应产生了重大影响。针对1972年6月22日发生的与Agnes飓风有关的事件，对Dead Run流域的洪水水力进行了检查。将二维水力模型TELEMAC-2D与有限元网格结合使用，该网格由高分辨率LiDAR地形数据和详细的现场勘测数据组合而成，以分析沿通道的边界切应力和单位流功率的分布和飓风艾格尼丝期间的洪泛区。这些参数相对于通道坡度和通道/谷底几何形状的时空分布为Dean Run通道的稳定性提供了有价值的见解。尽管发生了极端洪灾和数十年的城市发展，“死奔”河道平面形式的稳定性极有可能与河道和洪泛区形态的地质控制有关。版权所有（c）2006 John Wiley＆Sons，Ltd.

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