Management model for predicting nitrate leaching from grassland catchments in the United Kingdom: 1. Model development
作者:
H.J.E. RODDA,
D. SCHOLEFIELD,
B.W. WEBB,
D.E. WALLING,
期刊:
Hydrological Sciences Journal
(Taylor Available online 1995)
卷期:
Volume 40,
issue 4
页码: 433-451
ISSN:0262-6667
年代: 1995
DOI:10.1080/02626669509491431
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
This paper describes the development of a field-scale model that simulates the nitrogen (N) cycle in grazed grassland within a catchment-scale management model which can predict the loading and concentration of nitrate in rivers. The development is comprised of the addition of two sub-models of nitrate transport: one relating the amount of soil nitrate to its concentration in drainage water for different types of soil, and the second accounting for the proportion of permeable rock underlying the catchment. The sub-model that calculates the supply and transport of soil nitrate has been made sensitive to annual patterns of weather according to a classification based on the maximum soil water deficit. The model predictions were tested against best estimates of annual load and peak concentration of nitrate in rivers draining 11 small, predominantly grassland, catchments in the UK during the period 1974–1987.
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