Watershed urbanization and changing flood behavior across the Los Angeles metropolitan region
Watershed urbanization and changing flood behavior across the Los Angeles metropolitan region
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DOI：
10.1007/s11069-008-9241-7
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发表时间：
2009
期刊：
影响因子：
3.7
通讯作者：
J. Sheng;John P. Wilson
中科院分区：
文献类型：
--
作者：
J. Sheng;John P. Wilson
本文研究了流域城市化对洛杉矶大都市区河流洪水行为的影响。流量计数据，空间分布的降雨量数据，土地利用/土地覆盖，人口普查数据被用来量化洪水行为和城市化在多个流域的变化。在城市化的早期阶段，当人口密度相对较低时，洪水流量开始增加，但不同流域的洪水流量的增加率取决于不透水面的分布和防洪措施。这种空间变异性的总体径流指数和不断增加的洪水风险在整个大都市地区提出了一个挑战，传统的洪水应急管理，这通常是响应洪水的损害，而不是关心更广泛的问题，土地利用，土地覆盖和规划。本研究指出，替代性土地利用规划及洪水管理措施可减轻城市洪水所造成的危害。
This article examines the effects of watershed urbanization on stream flood behavior in the Los Angeles metropolitan region. Stream gauge data, spatially distributed rainfall data, land use/land cover, and census population data were used to quantify change in flood behavior and urbanization in multiple watersheds. Increase in flood discharge started at the very early stage of the urbanization when the population density was relatively low but the rate of increase of flood discharge varied across watersheds depending on the distribution of the imperviousness surface and flood mitigation practices. This spatial variability in rainfall–runoff indices and the increasing flood risk across the metropolitan region has posed a challenge to the conventional flood emergency management, which usually responds to flood damages rather than being concerned with the broader issues of land use, land cover, and planning. This study pointed out that alternative land use planning and flood management practices could be mitigating the urban flood implemented hazard.