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STWIR Abstract

STWIR, a Microorganism Transport with Infiltration and Runoff:
The add-on Module for the KINEROS2 Runoff and Erosion Model

Runoff from manured fields is often considered to be the source of microorganisms in the surface water used for irrigation, recreation, and household needs. Concerns of microbial safety of this water resulted in development of predictive models for estimating the concentrations and total numbers of pathogen and indicator organisms leaving manure fertilized fields in overland flow during runoff events. The KINEROS2 surface flow model (www.tucson.ars.ag.gov/kineros) has been developed to simulate event-based runoff from small agricultural and urban watersheds. STWIR (Simulator of Transport With Infiltration and Runoff) is the microorganism routing add-on module for KINEROS2. Surface runoff transport of soil and manure-born microorganisms are computed based on advection-dispersion equations (module STWIR) coupled with the kinematic wave equation (module KINEROS2). Release of microorganisms from manure and microorganism exchange between soil and overland flow are simulated.

 
Rainfall simulation over runoff plots at the EMFSL Patuxent lysimeter site. Photo by A.K. Guber
Rainfall simulation over runoff plots at the EMFSL Patuxent lysimeter site.
Photo by A.K. Guber.