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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >A suburban sediment budget: Coarse-grained sediment flux through hillslopes, stormwater systems and streams
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A suburban sediment budget: Coarse-grained sediment flux through hillslopes, stormwater systems and streams

机译：郊区沉积物预算：通过Hillslopes，Stormwater System和Streams粗粒沉积物通量

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摘要

Sediment in urban stormwater systems creates a significant maintenance burden, while a lack of coarse-grained bed sediment in streams limits their ecological value and geomorphic resilience. Gravel substrates, for example, provide benthic habitat yet are often scoured from the channel bed only to end up in a detention basin or treatment wetland. This dual problem of both 'too much' and 'too little' coarse-grained sediment reflects a watershed sediment budget that is profoundly altered. We developed a conceptual urban coarse-grained (>0.5 mm) sediment budget across three domains: hillslopes (urban land surfaces), the built stormwater network and stream channels. We then quantified key sources, sinks and storages for a suburban case study, using a combination of hillslope and in-channel monitoring, and interrogation of local government records. Around 36% of the sediment supplied to the stormwater network reached the catchment outlet, a level of sediment delivery much higher than observed in similar-sized natural catchments. The remainder was deposited in the sediment cascade and either stored, or extracted and removed from the catchment (e.g. material deposited in sediment ponds and gross pollutant traps). Conventional urban drainage networks are characterized by high hillslope sediment supply and low storage, resulting in efficient sediment delivery. Channel erosion, deposition in (and extraction from) pipes and channels, and floodplain deposition are small compared to sediment transport through the cascade. An understanding of the sediment budget of urban headwater catchments can provide stormwater and waterway managers with the information they need to address specific sediment problems such as sedimentation in stormwater assets and geomorphic recovery of urban streams. (c) 2019 John Wiley & Sons, Ltd.
机译：城市雨水系统中的沉积物产生了重大的维护负担，而溪流中缺乏粗粒床沉积物限制了它们的生态价值和地貌弹性。例如，砾石基板提供底栖栖息地，但尚未从沟道床上彻底冲洗，以最终陷入拘留盆地或湿地。这种双重问题的“太多”和“太少”粗粒沉积物反映了流域沉积物预算，这是深刻的改变。我们在三个领域开发了概念城市粗粒（> 0.5毫米）沉积物预算：Hillslopes（城市陆地表面），内置的雨水网络和流渠道。然后，我们使用Hillslope和渠道监测的组合来定量郊区案例研究的关键来源，下沉和存储，以及当地政府记录的询问。大约36％的沉积物供应到雨水网络达到了集水区，沉积物级级别高于在类似尺寸的自然集水区中观察到的水平。其余部分沉积在沉积物级联中，并且可以储存或从集水区（例如，沉积在沉积物池塘和污染物陷阱中的材料）中除去和除去和除去）。传统的城市排水网络的特点是高山坡沉积物供应和低储存，导致有效的沉积物递送。与通过级联的沉积物运输相比，管道侵蚀，沉积（和来自）管道和通道的沉积和洪水沉积较小。了解城市椎间露沉积物的沉积物预算可以提供雨水和水道管理人员，这些信息有需要解决特定沉积物问题，如雨水资产和城市溪流的地貌恢复。 （c）2019 John Wiley＆Sons，Ltd。

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