Nutrient and Trace-Element Enrichment of Coeur d' Alene Lake, Idaho

摘要

The purpose of this cooperative study among the USGS, DEQ, and Coeur d'AleneTribe was to determine the lake's assimilative capacity for nutrients to assess the potential for development of an anoxic hypolimnion and the consequent release of nutrients and trace elements from the lakebed sediments. Seven major tasks were undertaken: (1) Assess physical, chemical, and biological characteristics in the limnetic and littoral zones of the lake; (2) quantify loads of water, nutrients, and selected trace elements into and out of the lake; (3) develop a nutrient load/lake response model of the lake; (4) using the model, simulate responses of the hypolimnetic dissolved-oxygen deficit to alterations in nutrient loads; (5) analyze lakebed sediments to determine concentration, partitioning, and environmental availability of selected trace elements; (6) characterize land use and land cover throughout the study area by using remote-sensing and geographic information system techniques; and (7) assemble the data base needed for development of a lake management plan.