Investigation of river eutrophication as part of a low dissolved oxygen total maximum daily load implementation
| Autor: | Russ Brown, Carol Kendall, Joel Herr, Gary M. Litton, Carl W. Chen, Randy A. Dahlgren, Nigel W.T. Quinn, Mark Brunell, William T. Stringfellow, Remie Burks, Sharon Borglin, Jeremy S. Hanlon, Justin Graham |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Chlorophyll
Environmental Engineering Watershed Models Biological California Rivers Tributary Phytoplankton Animals Biomass Environmental Restoration and Remediation Water Science and Technology Hydrology geography geography.geographical_feature_category Geography Chlorophyll A Estuary Eutrophication Plankton Oxygen Total maximum daily load Environmental science Water quality Environmental Monitoring |
| Zdroj: | Water Science and Technology. 59:9-14 |
| ISSN: | 1996-9732 0273-1223 |
| Popis: | In the United States, environmentally impaired rivers are subject to regulation under total maximum daily load (TMDL) regulations that specify watershed wide water quality standards. In California, the setting of TMDL standards is accompanied by the development of scientific and management plans directed at achieving specific water quality objectives. The San Joaquin River (SJR) in the Central Valley of California now has a TMDL for dissolved oxygen (DO). Low DO conditions in the SJR are caused in part by excessive phytoplankton growth (eutrophication) in the shallow, upstream portion of the river that create oxygen demand in the deeper estuary. This paper reports on scientific studies that were conducted to develop a mass balance on nutrients and phytoplankton in the SJR. A mass balance model was developed using WARMF, a model specifically designed for use in TMDL management applications. It was demonstrated that phytoplankton biomass accumulates rapidly in a 88 km reach where plankton from small, slow moving tributaries are diluted and combined with fresh nutrient inputs in faster moving water. The SJR-WARMF model was demonstrated to accurately predict phytoplankton growth in the SJR. Model results suggest that modest reductions in nutrients alone will not limit algal biomass accumulation, but that combined strategies of nutrient reduction and algal control in tributaries may have benefit. The SJR-WARMF model provides stakeholders a practical, scientific tool for setting remediation priorities on a watershed scale. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|