Point and non-point source nutrient loading simulation for the Takasaki River Basin, Chiba–Japan

Simulation-Optimization Approach for Trading Point and Non-point Source Nutrient Permits

Excess nutrients in surface water systems cause many environmental problems. Some governments restrict nutrient overloading through nutrient permits. Economic theory states that the best allocation of such permits is made via trading. However, nutrient permit trading is complicated by two factors associated especially with non-point sources: (1) time lags between loading and appearance in a wat...

Study on Vegetable Field Evaluation Index System for Non-Point Source Pollution of Dagu River Basin

This research combined data from soil, terrain and meteorological surveys, with quantitative data from soil and water field studies to determine the leaching processes of nitrogen and phosphorus contaminants from field vegetation into the Dagu River. Using the Gray correlation analysis method, precipitation and irrigation were established as the major driving force behind leaching losses from c...

Agricultural Non-point Source Pollution Load Estimation Method in Haihe River Basin

the agricultural non-point source pollution shows some special features such as dispersion, randomness, fuzziness and cumulative compared with industry and other point source pollution. Owing to lacking complete and systematic data on agricultural sources of pollution in the long-term, Agricultural non-point source pollution load of the new method "IS (Investigation-Statistics) estimation metho...

Point-Nonpoint Nutrient Trading in the Susquehanna River Basin: Technical Appendices

Anthropogenic point-source and non-point-source nitrogen inputs into Huai River basin and their impacts on riverine ammonia–nitrogen flux

This study provides a new approach to estimate both anthropogenic non-point-source and point-source nitrogen (N) inputs to the landscape, and determines their impacts on riverine ammonia–nitrogen (AN) flux, providing a foundation for further exploration of anthropogenic effects on N pollution. Our study site is Huai River basin of China, a watershed with one of the highest levels of N input in ...