Historic record of pasture soil water and the influence of the North Atlantic Oscillation in south-west England
Historic record of pasture soil water and the influence of the North Atlantic Oscillation in south-west England
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英格兰西南部牧场土壤水的历史记录和北大西洋涛动的影响
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
L. Cárdenas
中科院分区：
文献类型：
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作者：
A. Shepherd;Wellen Atuhaire;Lianhai Wu;D. Hogan;R. Dunn;L. Cárdenas
用于英格兰西南部可持续草原研究的北怀克农场平台包含测量土壤湿度和田间径流的基础设施。其传感器数据的时间序列用于验证现场尺度土壤水的简约 SH 2 O-NW 模型。模拟了三十四年的日常土壤湿度和径流，并用于检测长期趋势并进行风险分析。该模型考虑了土壤湿度的湿润时期以及主要的夏季土壤亏缺和秋季再湿润；局限性涉及干燥和再润湿的短期、快速变化。然而，土壤湿度传感器的观测结果并不反映现场的变化。对多个字段的分析可以评估意外的传感器异常情况。该论文建议提供土壤湿度传感器的置信水平，以便与建模数据进行比较。模拟显示，夏季土壤水分亏缺的发生率历史性地减少到水容量的三分之一以上，而冬季降水和径流模拟则显示出稳定的长期趋势，与北大西洋涛动指数的方向和幅度相匹配。 1.75 公顷牧场产生 400 m 3 /天的大径流量的概率为 0.07%，在 34 年期间每四年出现一次。
The North Wyke Farm Platform for sustainable grassland research in south-west England contains infrastructure measuring soil moisture and field runoff. Its time series of sensor data is used to validate the parsimonious SH 2 O-NW model for soil water at field-scale. Thirty-four years of daily soil moisture and runoff is simulated, and used to detect long-term trends and produce a risk analysis. The model accounts for wetter periods of soil moisture and the main summer soil deficit and autumn re-wetting; limitations involve short-term, rapid changes in drying and re-wetting. The soil moisture sensor observations however do not reflect field variability. Analysis of more than one field allows an assessment of unexpected sensor anomalies. The paper recommends that soil moisture sensor confidence levels be provided, for comparison against modelled data. The simulations show a historic reduction in the occurrence of summer soil moisture deficits above a third of water capacity, while the winter precipitation and runoff simulation shows a stable long-term trend, matching the direction and magnitude of the North Atlantic Oscillation Index. A large runoff of 400 m 3 /day from a 1.75 ha pasture has a 0.07% probability, having a return period of once in four years during the 34-year period.