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首页> 外文期刊>Water Science and Technology >Can stormwater harvesting restore pre-development flows in urban catchments in South East Queensland?
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Can stormwater harvesting restore pre-development flows in urban catchments in South East Queensland?

机译：集雨雨能否恢复昆士兰州东南部城市集水区的开发前流量？

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Increases in the impervious area due to urbanisation have been shown to have negative impacts on the physical and ecological condition of streams, primarily through increased volume and frequency of runoff. The harvesting and detention of runoff has a potential to decrease this impact. This paper describes the effects of urbanisation on catchment flow and of stormwater harvesting on reducing those adverse impacts on a stream in South East Queensland (SEQ), Australia. A largely undeveloped catchment located southeast of Brisbane city was calibrated and validated using the Stormwater Management Model (SWMM). This model was used to investigate the effect of a range of future increases in urbanisation (represented by impervious area) on stream hydrology as well as the potential of stormwater harvesting to return the catchments to predevelopment flow conditions. Stormwater harvesting was modelled according to flow frequency measures specified in current SEQ development guidelines. These guidelines stipulate the capture of the first 10 mm of runoff from impervious areas of 0-40% and the first 15 mm from impervious areas of 40% or greater for urban developments. We found that increases in the impervious area resulted in increases in the mean, frequency and duration of high flows, and an increase in the mean rate of rise and fall for storm events in the catchment. However, the predevelopment (non-urbanised) flow distribution was very flashy in comparison with all urbanised scenarios; i.e. it had the quickest response to rainfall indicated by a high rate of rise to and fall from peak flow volume, followed by a return to zero flow conditions. Capturing the runoff according to the development guidelines resulted in a reduction in flow towards the flow distribution of a lower impervious area, however this was insufficient to meet predevelopment conditions. This suggests a stronger influence of impervious areas in this catchment on the volume of runoff than flow frequency measures are able to ameliorate.
机译：已经表明，由于城市化而导致的不透水面积的增加，对溪流的物理和生态条件产生了负面影响，主要是通过增加径流量和频率来实现的。径流的收集和保留有可能减少这种影响。本文介绍了城市化对集水量的影响以及雨水收集对减少对澳大利亚东南昆士兰州（SEQ）的河流造成的不利影响的影响。使用雨水管理模型（SWMM）对位于布里斯班市东南部的一个很大程度上未开发的流域进行了校准和验证。该模型用于调查未来城市化范围的增长（以不透水地区表示）对溪流水文的影响，以及收集雨水使集水区恢复到开发前流量状态的潜力。根据当前SEQ开发指南中指定的流量频率度量对雨水收集进行建模。这些准则规定，对于城市发展，应从0-40％的不透水区域捕获前10毫米的径流，从40％或更高的不透水区域捕获前15毫米的径流。我们发现，不透水区域的增加导致高流量的平均值，频率和持续时间的增加，以及集水区风暴事件的平均上升和下降速率的增加。但是，与所有城市化方案相比，开发前（非城市化）的流量分配非常繁琐。也就是说，它对降雨的响应最快，这是由峰值流量的高上升和下降速率指示的，然后返回零流量状态。根据开发指南捕获径流导致流量减少，流向较低的不透水区域，但这不足以满足开发前的条件。这表明该流域不透水区域对径流量的影响比流量频率测量方法能够改善的更大。

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