Groundwater flow and nitrate migration in a Dutch-Belgian chalk catchment; observed and future concentrations

• Autorzy: Kłonowski M. , Lanen H. van , Dijksma R.
• Języki publikacji: EN

Abstrakty

EN

In the catchment of the Noor brook, by the Dutch/Belgian border, excess precipitation with high nitrate concentrations (80-120 mgˇl-1) recharges the Cretaceous multi-aquifer system under the plateau and foothill (agricultural area). The nitrates are transported through the aquifer (median NO3-> 50 mgˇl-1 under the plateau) towards springs and wetlands of the Noorbeemden nature reserve. The major spring has a concentration of 70-80 mgˇl-1. The concentration in the Noor brook is somewhat lower (median 46 mgˇl-1) because of denitrification in the wetlands. The groundwater flow and transport model FLONET/TRANS was used to simulate the development of the nitrate distribution in the last 50 years. The general NO3-distribution in the northern part of the catchment could be reasonably well predicted, whereas the concentrations in the southern part were underestimated by about 20 mgˇl-1. The simulated future trend in the northern part of the catchment in the next 100 years shows that a reduction of nitrate leaching by 50% is required to level off the currently still increasing concentrations. A dramatic decrease of leaching by 75% is needed to achieve pre-1950's concentrations. This implies that the management plan of the Noorbeemden Nature Reserve, which is complied by the Nature Conservation Organisation, should not aim at botanical restoration in the first decades, even if severe restrictions in nitrogen application are imposed on the farmers now.

Słowa kluczowe

EN

Netherlands; Belgium; Cretaceous chalk aquifer; groundwater flow; nitrate leaching; modelling; nitrate reduction policy

• Wydawca: Państwowy Instytut Geologiczny - Państwowy Instytut Badawczy
• Czasopismo: Geological Quarterly
• Rocznik: 2001
• Tom: Vol. 45, No 1
• Strony: 53--66
• Opis fizyczny: Bibliogr. 22 poz., rys., rys., wykr.

Twórcy

autor

Kłonowski M.

• Polish Geological Institute, Lower Silesian Branch, Jaworowa 19, PL-53-122 Wrocław, Poland

autor

Lanen H. van

• Subdepartment of Water Resources , Wageningen University, Nieuwe Kanaal 11, 6709 PA Wageningen, The Netherlands

autor

Dijksma R.

• Subdepart ment of Water Resources, Wageningen University, Nieuwe Kanaal 11, 6709 PA Wageningen, The Netherlands

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