Modelling pesticide run-off to surface waters. Part II: Model application

✍ Scribed by Williams, Richard J.

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 225 KB
• Volume: 54
• Category: Article
• ISSN: 1526-498X
• DOI: 10.1002/(sici)1096-9063(1998100)54:2<121::aid-ps808>3.0.co;2-l

✦ Synopsis

A conceptual model of pesticide run-o † to surface water from agricultural land has been tested against data collected from a catchment study. In general the model was able to simulate total run-o † and pesticide loss and peak pesticide concentrations to an acceptable level (much better than an order of magnitude) for a number of pesticides in run-o † events over Ðve seasons. Hourby-hour variations in pesticide run-o † were reasonably well estimated, although the timing of the estimated peak in pesticide concentrations was always in advance of that observed. A simple sensitivity test of the model showed the sorption coefficients and half-lives of the chemicals simulated were important in controlling model outputs, although the impact of the latter was reduced if events occurred soon after application. Other important parameters were the extent of the enhanced conductivity area above the drains and the parameters controlling the rate of Ñow of water between the model boxes.