首页|Simulating water balance and nutrient losses in a pastoral catchment using the SWAT plus model: added value of isotope data
Simulating water balance and nutrient losses in a pastoral catchment using the SWAT plus model: added value of isotope data
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NETL
NSTL
Taylor & Francis
New Zealand's freshwater is under increasing pressure from intensified dairy farming. This study assesses agricultural nitrogen loads from small pastoral catchments contributing to eutrophication and periodic algae blooms in a lake. Using the Soil and Water Assessment Tool (SWAT+), we simulated hydrological processes and nutrient loads, incorporating water (delta H-2, delta O-18) and nitrate (delta N-15, delta O-18) isotope data to improve model performance. The SWAT+ model was calibrated and validated with flow and nitrate data, achieving R-2 values of 0.65-0.90, Nash-Sutcliffe efficiency (NSE) of 0.46-0.82, and percent bias (PBIAS) between 10.24% and 33.48%. The study demonstrates that stable isotope insights can enhance SWAT+ modelling accuracy and highlight the need for better fertilizer management to reduce nutrient loads.
NETL
NSTL
Taylor & Francis
