THE ROLE OF INTERNAL LOADINGS
Studies on interactions between sediments and overlying waters in eutrophicated lakes are of particular importance because internal nutrient loading, coming from the sediments, can be of the same order of magnitude or even greater than the external input. As a consequence, the knowledge of the sediment's role on the internal cycling of nutrients is essential to evaluate lake recovery time since internal loading tends to perpetuate an undesirable condition. In this paper the main processes responsible for the mobilization and the transport of nutrients (nitrogen and phosphorus) have been summarized. Physico-chemical and biological factors regulating the exchanges across the sediment - water interface have been also considered. Methods and their limitations for assessing internal nutrient loading have been discussed. Furthermore, some important aspects which need consideration in any lake restoration programmes, like bioavailability and saturation level of sediment P, lake morphology and vertical internal mixing processes, have been outlined. The use of dynamic models, taking into account the P released from sediments, can give a much more correct evaluation of recovery time of the waterbodies. This will satisfy the requirements of a more effective management of water quality.
Bibliographic Reference: CONGRESSO INTERNAZIONALE "INQUINAMENTO E RECUPERO DEI LAGHI", ROMA (ITALY), APRIL 15-18, 1985 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 32001 ORA
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Record Number: 1989123087600 / Last updated on: 1987-01-01
Available languages: en