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Dynamics of sediment delivery in drain flow on clay soils across England and Wales

机译：英格兰和威尔士粘土上排水流中泥沙输送的动力学

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摘要

A large area of agricultural land across England and Wales is on drained clay soils. Field drains have been shown to be an efficient pathway for the delivery of sediment and associated agricultural pollutants to watercourses. As part of a major monitoring programme on agricultural diffuse pollution, sediment samples were collected from hydrologically-isolated experimental plots at two sites in England from 2007 to 2009. Temporal variations in drain sediment loss for different land use and soil types were examined and relationships between drain flow and sediment concentration were also explored. The data analysis has shown that there are significant contrasts between the two soil types under investigation and that the observed sediment concentrations are often above the limits set for freshwater fish. Efforts are being made to characterize the observed patterns with respect to soil and climate conditions to assist extrapolation to national scale for policy support purposes.
机译：英格兰和威尔士的大部分农业用地都在排水的粘土上。田间排水沟已被证明是向河道输送沉积物和相关农业污染物的有效途径。作为一项主要的农业扩散污染监测计划的一部分，从2007年至2009年从英格兰两个地点的水文隔离实验区收集了沉积物样品。研究了不同土地利用和土壤类型的排水沉积物流失的时间变化及其之间的关系。还研究了排水流量和沉积物浓度。数据分析表明，所研究的两种土壤类型之间存在显着差异，观察到的沉积物浓度通常高于淡水鱼所设定的极限。目前正在努力确定观测到的土壤和气候条件的特征，以协助出于政策支持目的外推至国家规模。

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