|Data on temperature, oxygen, sediment and transparancy of the water in the northern part of the Delta area of the Netherlands between 1961 and 1972|
Peelen, R. (1974). Data on temperature, oxygen, sediment and transparancy of the water in the northern part of the Delta area of the Netherlands between 1961 and 1972. Hydrobiologia 45(1): 115-134
In: Hydrobiologia. Springer: The Hague. ISSN 0018-8158, more
Hydrology; Oxygen; Sediment structure; Water temperature; Water transparency; Marine
A description is given of changes in temp, oxygen content, suspended matter and transparency of light in the waters of the northern part of the Delta area of the south-West Netherlands, during various phases in the realization of the Delta Plan between 1961 and 1972. In the open estuaries a temp gradient was established between the highly fluctuating rivers and the more stable sea. Temps in the closed, stagnant or semi-stagnant basins are almost equal throughout the length of the basin, but vertical stratification developed in the deeper parts. In the original situation the conc of suspended matter was very high in the water, not only owing to natural causes but also owing to dredging of sand and construction of dams. After the closures sedimentation of suspended matter took place. Accordingly Secchi-disc values increased after the closures in the stagnant basins Transparancy of the water -measured with a radiation meter - was seen to increase as well.