About Us | Help Videos | Contact Us | Subscriptions
 

Abstract

 

This article in JEQ

  1. Vol. 19 No. 3, p. 421-427
     
    Received: May 16, 1989


    * Corresponding author(s):
 View
 Download
 Alerts
 Permissions
 Share

doi:10.2134/jeq1990.00472425001900030012x

Modeling Linked Watershed and Lake Processes for Water Quality Management Decisions

  1. R. M. Summer *,
  2. C. V. Alonso and
  3. R. A. Young
  1. U SDA-ARS, Box 1430, Durant, OK 74702-1430;
    U SDA-ARS, Fort Collins, CO 80522;
    U SDA-ARS, Morris, MN 56267.

Abstract

Abstract

A physically based modeling approach is used to link watershed with lake processes and to simulate their responses to land management and weather conditions. Components of the watershed model, AGNPS (agricultural nonpoint-source model), are hydrology, erosion, sediment transport, transport of nitrogen and phosphorus, and chemical oxygen demand. Using a cellular structure, runoff, sediment, and chemical variables from the watershed provide input to a lake model. This one-dimensional model of water bodies simulates temperature stratification, mixing by wind, sedimentation, inflow density current, and algal growth. Unsteady advection-diffusion equations characterize the dynamics of suspended sediment, soluble and sediment-attached N and P, and chlorophyll. This model, AGNPS-LAKE, is driven by random generation of weather conditions on a daily basis. Resulting impacts of alternative management plans are simulated by changing agricultural practices and land use, thereby modifying inflow characteristics to a lake. Modeling capabilities are being tested on eutrophic lakes in Minnesota for the purpose of simulating long-term trends and impacts of best management practices.

  Please view the pdf by using the Full Text (PDF) link under 'View' to the left.

Copyright © .