Accession Number:

ADA456247

Title:

Chlorophyll a and Inorganic Suspended Solids in Backwaters of the Upper Mississippi River System: Backwater Lake Effects and Their Associations With Selected Environmental Predictors

Descriptive Note:

Corporate Author:

GEOLOGICAL SURVEY LA CROSSE WI UPPER MIDWEST ENVIRONMENTAL SCIENCES CENTER

Personal Author(s):

Report Date:

2006-01-01

Pagination or Media Count:

3.0

Abstract:

The Long Term Resource Monitoring Program LTRMP uses a stratified random sampling design to obtain water quality statistics within selected study reaches of the Upper Mississippi River System UMRS. LTRMP sampling strata are based on aquatic area types generally found in large rivers e.g., main channel, side channel, backwater, and impounded areas. For hydrologically well-mixed strata i.e., main channel, variance associated with spatial scales smaller than the strata scale is a relatively minor issue for many water quality parameters. However, analysis of LTRMP water quality data has shown that within-strata variability at the strata scale is high in off-channel areas i.e., backwaters. A portion of that variability may be associated with differences among individual backwater lakes i.e., small and large backwater regions separated by channels that cumulatively make up the backwater stratum. The objective of the statistical modeling presented here is to determine if differences among backwater lakes account for a large portion of the variance observed in the backwater stratum for selected parameters. If variance associated with backwater lakes is high, then inclusion of backwater lake effects within statistical models is warranted. Further, lakes themselves may represent natural experimental units where associations of interest to management may be estimated.

Subject Categories:

  • Inorganic Chemistry
  • Water Pollution and Control

Distribution Statement:

APPROVED FOR PUBLIC RELEASE