Stream erosion potential and stormwater management strategies
Stream erosion potential and stormwater management strategies
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DOI：
10.1061/(asce)0733-9496(2002)128:6(451
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发表时间：
2002-11-01
期刊：
影响因子：
--
通讯作者：
Bledsoe, BP
中科院分区：
文献类型：
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作者：
Bledsoe, BP
水文和沉积物输送模型被用来检查典型的雨水管理政策在减少河道侵蚀潜力方面的有效性。将两个底质函数和三个总负荷运移关系应用于 8 毫米砾石和 0.5 毫米沙床材料，以比较这些关系在估计不同沉积物运移模式的滞留要求方面的性能。不同的沉积物-输送关系对沉积物-输送能力的估计存在很大差异，但提出的滞留量要求一致在 20% 以内。控制累积泥沙量的滞留设计要求滞留库容量比峰值控制滞留设施大 61%，并导致子岸全剪应力的时间分布发生变化。基于时间积分泥沙输送能力的雨水设施设计可能会无意中导致河道不稳定和基质变化，除非该方法考虑了子岸满流的频率分布、输送异质床和岸材料的能力以及流入泥沙负荷的潜在变化。
Hydrologic and sediment transport modeling were used to examine the effectiveness of typical stormwater management policies in reducing the potential for stream-channel erosion. Two bedload functions and three total-load transport relationships were applied to 8 mm gravel and 0.5 mm sand bed materials to compare the performance of the relationships in estimating detention requirements across modes of sediment transport. The various sediment-transport relationships yielded widely diverging estimates of sediment-transport capacity and yet suggested detention volume requirements that agreed within 20%. Detention design for control of cumulative sediment load required a detention storage volume 61 % greater than a peak control detention facility and resulted in an altered temporal distribution of sub-bank-full shear stress. Design of stormwater facilities based on time-integrated sediment-transport capacity may inadvertently result in channel instability and substrate changes unless the approach accounts for the frequency distribution of sub-bank-full flows, the capacity to transport heterogeneous bed and bank materials, and potential shifts in inflowing sediment loads.