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首页> 外文会议>International Drainage Symposium >Runoff and subsurface drain response from mole and gravel mole drainage across episodic rainfall events inIreland
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Runoff and subsurface drain response from mole and gravel mole drainage across episodic rainfall events inIreland

机译：鼹鼠和砾石鼹鼠跨越情节降雨事件的径流和地下排水响应来自群岛

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Shallow drainage techniques such as mole and gravel mole drainage are used in low permeability soils to siphon off infiltrating rainwater and mitigate the associated rise in watertable. Their purpose is to improve trafftcability and agricultural production. In Ireland, long-term climate predictions envisage an increased level of short-term extreme rainfall events. Therefore, a key question is how these drainage techniques perform during episodic, high intensity rainfall events, specifically in termsof discharge hydrographs and associated parameters (principally flow start time, flow peak time, lag time, peak flow rate and flashiness index). We examined 12 rainfall events over a 1 year period on a clay-loam dominated grassland site of 1.4% slope inthe south of Ireland. Four drainage treatments, namely; (A) an un-drained control, (B) Mole drainage installed in January 2011 (sub-optimal installation conditions), (C) Mole drainage installed in July 2011 (optimal installation conditions) and (D) Gravel mole drainage installed in July 2011 were examined. Results showed that gravel mole drainage exhibited shorter response times to rainfall events and ultimately drained greater volumes. Drain flow from mole drainage treatments B and C produced longer start, peak and lag times and lower peak and total flows relative to the other flow discharges. Variations in discharges from all treatments were closely correlated to soil moisture status, 30 day antecedent rainfall and rainfall event intensity. Drain flow response in all treatments was seen to deteriorate in time with the strongest responses evident in early events. Flow hydrographs showed strong variation in flow characteristics, within and across treatments and across events. If the predicted increasein short-term extreme rainfall events materializes then such systems will have to operate in increasingly adverse conditions. This will require changes in system design to improve the effectiveness of mole and gravel mole drainage.
机译：浅排水的技术，如摩尔和砾石摩尔引流在低渗透性的土壤用于抽走浸润雨水和减轻在地下水位相关上升。他们的目的是为了提高trafftcability和农业生产。在爱尔兰，长期气候预测设想短期极端降雨事件水平的提高。因此，关键的问题是如何将这些排水技术特别是在termsof放电水文和相关联的参数期间发作，高强度降雨事件执行，（主要是流开始时间，流峰时间，滞后时间，峰值流量和浮华索引）。我们研究过了1年期爱尔兰的1.4％坡度在矿井南部的粘土壤土为主的草原网站12个降水事件。四引流治疗，即; （A）的未排出控制，（B）摩尔排水安装在2011年1月（亚最佳安装条件），安装在安装于2011年7月（最佳安装条件）和（d）砾石摩尔排水七月（C）摩尔排水2011年进行了检查。结果表明，砾石摩尔排水表现出更短的响应时间，以降雨事件并最终排出更大体积。从排水摩尔治疗B和C排水流出品再启动，峰值和滞后时间和较低的峰值和相对于其它流放电总流动。在所有的处理排放的变化密切相关，土壤水分状况的30天前期降雨，降雨强度事件。在所有治疗放泄流量响应被认为在时间上与早期事件明显了强烈反馈恶化。流量水文表现出的流动性强的变化，内部和整个治疗和整个事件。如果预测increasein短期极端降雨事件物化那么这样的系统将必须在日益不利的条件。这将需要在系统设计修改，完善摩尔和砾石开沟排水的效果。

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