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原文传递 Incorporating Water Quality Analysis into Navigation Assessments as Demonstrated in the Mississippi River Basin

题名：	Incorporating Water Quality Analysis into Navigation Assessments as Demonstrated in the Mississippi River Basin
正文语种：	eng
作者：	Barbara A. Kleiss;Jennifer C. Murphy;Casey M. Mayne;Jake P. Allgeier;Amanda B. Edmondson;Katrina C. Ginsberg;Keaton E. Jones;Timothy J. Lauth;Emily L. Moe;Julie W. Murphy;Mead A. Allison
作者单位：	Dept. of River-Coastal Science and Engineering Tulane Univ. New Orleans LA 70118;US Geological Survey Central Midwest Science Center DeKalb IL 60115;Engineer Research and Development Center-Coastal and Hydraulics Laboratory US Army Corps of Engineers Vicksburg MS 39180;Louisville District US Army Corps of Engineers Louisville KY 40202;Little Rock District US Army Corps of Engineers Little Rock AR 72203;Dept. of Earth and Environmental Sciences Tulane Univ. New Orleans LA 70118;Engineer Research and Development Center-Coastal and Hydraulics Laboratory US Army Corps of Engineers Vicksburg MS 39180;Engineer Research and Development Center-Coastal and Hydraulics Laboratory US Army Corps of Engineers Vicksburg MS 39180;St. Paul District US Army Corps of Engineers St. Paul MN 55101;New Orleans District US Army Corps of Engineers New Orleans LA 70118;Dept. of River-Coastal Science and Engineering Tulane Univ. New Orleans LA 70118
摘要：	A description of historical and ambient water quality conditions is often required as part of navigational studies. This paper describes a series of tools developed by the USGS that can aid navigation managers in developing water quality assessments. The tools use R, a statistical software program, and provide methods to retrieve historical streamflow and water quality data, summarize observations, model concentrations and fluxes, and estimate seasonal, annual, and decadal trends. The utility of these tools is demonstrated by providing an analysis of the seasonal variability and long-term trends of nitrate plus nitrite, orthophosphate, and suspended sediment concentrations and fluxes at nine sites in the Mississippi River Basin. Trends in annual mean concentration and flux showed fairly stable nitrate plus nitrite at most of the nine sites, with increases in the Upper Mississippi and Missouri Rivers and decreases on the Illinois River over a 40-year period beginning in 1980. Orthophosphate concentration or flux increased at almost all sites over a similar time period. Conversely, a concurrent steady decline in suspended sediment concentrations and fluxes was noted at sites throughout the basin.
出版年：	2021
期刊名称：	Journal of Waterway, Port, Coastal and Ocean Engineering
卷：	147
期：	5