Balancing between retention and flushing in river networks--optimizing nutrient management to improve trophic state

The Science of the Total Environment
Mark HontiAdam Kovacs

Abstract

River basin management can frequently involve decisive situations, when conflicting interests must be resolved. In the Zala River catchment (Western Hungary) local efforts to improve water quality by reducing algal biomass are not always harmonized with the requirement of sustaining the same objective in its recipient, Lake Balaton. The PhosFate catchment model is a GIS tool designed to estimate the spatial variability and fate of diffuse phosphorus emission during transport. Besides diffuse pollution, a simplified annual hydrologic balance is also calculated. A new module was added to PhosFate that tracked the development of entrained algae during their travel downstream. The extended model was used to simulate the current average algal concentrations in the river network. The numerous small reservoirs and impoundments on the tributaries of the Zala River were identified as the key elements in determining algal biomass, since they fundamentally increase the water residence time (WRT) in the system. Without reservoirs, the short WRT in the drainage network would successfully prevent the development of suspended algal biomass despite the fairly high SRP concentrations. However, the removal of such standing waters is impossible f...Continue Reading

References

Jan 24, 2007·The Science of the Total Environment·G BillenM Benoît
Jun 13, 2008·Water Science and Technology : a Journal of the International Association on Water Pollution Research·A S KovacsA Clement
Aug 2, 2008·Proceedings of the National Academy of Sciences of the United States of America·Kerstin ElfrinkKlaus Gerwert
Sep 23, 2008·The Science of the Total Environment·P J A Withers, H P Jarvie

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