کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
6411666 1629927 2015 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Connecting large-scale atmospheric circulation, river flow and groundwater levels in a chalk catchment in southern England
ترجمه فارسی عنوان
اتصال گردش خون جوی بزرگ، جریان رودخانه و سطح آب زیرزمینی در یک حوضه گچ در جنوب انگلستان
کلمات کلیدی
آب های زیرزمینی، گردش خون در مقیاس بزرگ، تجزیه و تحلیل کامپوزیت، رودخانه لامبورگ، جنوب انگلیس،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
چکیده انگلیسی


- Strong pressure gradient is over North Atlantic Ocean during high groundwater events.
- A blocking high pressure system is found across Britain during low groundwater events.
- Varying sequences of atmospheric patterns cause high and low groundwater levels.

SummaryGroundwater is an important water resource and globally it represents the largest distributed store of freshwater. In southern England, groundwater is a major source for public water supply, and many aquifers have recently experienced both extreme low and high groundwater levels. In this paper, we use observations of precipitation, river discharge and groundwater levels (1964-2010) and an atmospheric reanalysis to explore the large-scale climate patterns preceding the nine highest and lowest March river discharge and groundwater levels in the chalk catchment of the River Lambourn (Berkshire Downs, southern England). Peak monthly precipitation is shown to occur from October to January, while the highest river discharge and groundwater levels are found from February to April. For high discharge/groundwater levels, composite anomaly patterns of the mean sea level pressure show a stronger than average pressure gradient across the North Atlantic Ocean, with enhanced water vapour transport across southern England. For the lowest discharge/groundwater levels, a blocking high pressure system is found across the British Isles deflecting storms and precipitation to the north. Significantly, the intra-composite variability suggests that different sequences of atmospheric states may lead to high and low discharge/groundwater events.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hydrology - Volume 523, April 2015, Pages 179-189
نویسندگان
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