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Effect of Peri-urban Development and Lithology on Streamflow in a Mediterranean Catchment

机译：地中海集水区枢纽开发与岩石学的影响

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Predicting the impact of urbanization on the hydrology of peri-urban catchments remains a challenge. Using data from nine streamflow gauges installed in a small Portuguese catchment, this study investigates the streamflow responses over a 3-year period. The catchment comprises unique nested sub-catchments, characterized by varying proportions of non-urban land-use (17-97%) and impermeable surfaces (6-36%), distances between the urban areas and the stream network and storm drainage systems (piped versus dispersed) and overlying distinct lithologies consisting of sandstone and limestone. The results show that in the peri-urban catchment (39% urban and 22% impervious surfaces) most water infiltrated and annual storm runoff varied between 9% and 13% of rainfall. In urban sub-catchments (approximate to 50% urban), 29% of rainfall became storm runoff on sandstone and 17% on limestone. In sub-catchments with more than 80% forest, storm runoff coefficients were averaged 6% independent of the lithology. Sub-catchments with storm runoff drainage systems and downslope urban areas had shorter response times (&20min) than dispersed urban sub-catchments, in which part of the runoff infiltrated, and the response time was up to 1h. Baseflow contributed between 25-33% upstream and 37-38% downstream of the sandstone total runoff, but was less than 5% in limestone areas independent of location. Hydrological impacts of urbanization may be minimized in planning through disconnecting the urban areas from the stream network, thereby enabling runoff from impervious areas to infiltrate into the soil in downstream forest patches before reaching the stream. Copyright (c) 2017 John Wiley & Sons, Ltd.
机译：预测城市化对围城区水域水文的影响仍然是一个挑战。本研究使用安装在小葡萄牙集水区中的九流式流量表中的数据调查了3年期间的Streamflow响应。该集水器包括独特的嵌套子集集，其特征在于不同的非城市土地利用（17-97％）和不可渗透表面（6-36％），城市地区和流网络和风暴排水系统之间的距离（管道与分散）和覆盖由砂岩和石灰石组成的不同岩性。结果表明，在围城区集水区（39％的城市和22％不透水表面），大多数水渗透和年度风暴径流在降雨量的9％和13％之间。在城市分流域（近似城市的50％）中，29％的降雨在砂岩上变成了风暴径流，石灰石上的17％。在具有超过80％森林的子流域中，风暴径流系数平均为6％，与岩性无关。具有风暴径流排水系统和下坡城市地区的子集水区具有比分散的城市集流域的响应时间（＆amp; 20分钟）更短，在其中渗透径流的部分，响应时间最长为1h。 BaseFlow在砂岩总径流下游和37-38％下游有贡献在25-33％之间，但在石灰石区域的距离小于5％，独立于位置。通过将城市区域与流网络断开，可以最大限度地减少城市化的水文影响，从而在到达流之前，从而使城市地区的径向从不透水区域渗透到下游森林贴片中的土壤中。版权所有（c）2017年John Wiley＆amp; SONS，LTD.

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