Experiments on the movement of brackish water near infiltration and abstraction wells
Stakelbeek, A. (1989). Experiments on the movement of brackish water near infiltration and abstraction wells. Natuurwet. Tijdschr. 70(1-4): 191-199
In: Natuurwetenschappelijk Tijdschrift. L. Walschot/Natuur- en Geneeskundige Vennootschap: Gent. ISSN 0770-1748, more
Also appears in:
De Breuck, W.; Walschot, L. (Ed.) (1989). Proceedings of the 10th Salt-Water Intrusion Meeting Ghent (Belgium), 16-20 May 1988. Natuurwetenschappelijk Tijdschrift, 70(1-4). Natuurwetenschappelijk Tijdschrift: Gent. 408 pp., more
The Provincial Waterworks of North Holland (PWN) are starting the construction of a 5 million m³/a deep-well plant in the North Holland dune area near the North Sea. In this plant, injection of filtrated IJssel-lake water and abstraction will take place at a depth of respectively 10 and 25 metres above the brackish zone, which is located about 100 m below mean sea level. Due to the fact that the injection will exceed the abstraction, intrusion and upconing of brackish water will be prevented. In case of calamities, when the infiltration may be interrupted, it is important to know for how long the abstraction can be continued, before upconing of brackish water will occur. For that purpose, in the period 1983-1987 the Provincial Waterworks have investigated in the movement of the brackish zone by abstracting and infiltrating water in a deep well, of which the filter was located only 10 metres above the brackish zone. During the experiments the movement of the brackish zone was intensively measured by vertical multi-electrode cables. During the abstraction the brackish zone reached the well-filter within two months. After a break of a few years, during which the measurements were continued, the brackish zone was pushed downwards by infiltrating fresh water. Due to the growing distance between the well filter and the brackish zone during the infiltration, the vertical velocity of the brackish zone decreased in time. In order to extrapolate the conclusions of the infiltration and abstraction experiment to the future deep-well plant, the experiments on the movement of the brackish zone are simulated by computer modelling. For the simulations two different computer codes AQ-AS and SALTP3 have been tested and compared.
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