Hydrological modelling of drained blanket peatland
Hydrological modelling of drained blanket peatland
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DOI：
10.1016/j.jhydrol.2011.07.005
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发表时间：
2011-09-15
影响因子：
6.4
通讯作者：
Wallage, Z. E.
中科院分区：
文献类型：
--
作者：
Ballard, C. E.;McIntyre, N.;Wallage, Z. E.
明沟排水是一种常见的高地毯泥炭地实施的土地管理实践，特别是在英国，在20世纪40年代和70年代之间的政策决定导致了广泛的高地排水。人们对与泥炭层排水有关的水文状况的变化知之甚少，但已认识到洪水、低流量和水质的重要性。我们提出了一个新的简化的物理为基础的模型，允许相关的水文过程和流量响应进行探讨。该模型耦合四个一维模型，代表一个三维的山坡，允许探索整个模型域的流量和地下水位响应的排水配置和泥炭属性的范围。该模型进行了测试，对收集的数据集从Oughtershaw贝克，英国，结果显示出良好的模型性能的湿润期，虽然不符合钻孔观测在再湿润期。更广泛的探索模型的行为表明，该模型是一致的，在文献中报道的一些排水毯泥炭地的水文响应，因此有可能提供指导决策者的管理措施的影响。通过全球敏感性分析，我们得出结论，进一步的实地调查，以协助在表面和排水沟粗糙度参数化将有助于减少模型预测的不确定性。(C)2011爱思唯尔有限公司版权所有。
Open ditch drainage is a commonly implemented land management practice in upland blanket peatlands, particularly in the UK, where policy decisions between the 1940s and 1970s led to widespread drainage of the uplands. The change in the hydrological regime associated with the drainage of blanket peat is poorly understood, yet has perceived importance for flooding, low flows and water quality. We propose a new simplified physics-based model that allows the associated hydrological processes and flow responses to be explored. The model couples four one-dimensional models to represent a three-dimensional hillslope, allowing for the exploration of flow and water table response throughout the model domain for a range of drainage configurations and peat properties. The model is tested against a data set collected from Oughtershaw Beck, UK, with results showing good model performance for wet periods although less conformity with borehole observations during rewetting periods. A wider exploration of model behaviour indicates that the model is consistent with the hydrological response reported in the literature for a number of drained blanket peat sites, and therefore has potential to provide guidance to decision makers concerning the effects of management practices. Through a global sensitivity analysis, we conclude that further field investigations to assist in the surface and drain roughness parameterisation would help reduce the uncertainty in the model predictions. (C) 2011 Elsevier B.V. All rights reserved.