报告题目：Water Pollution Modelling and Water Resource Management
报告人 ：Dr. Junye Wang
Abstract：The river basin is an ecologically and economically significant resource for the economic development and ecological sustainability. However, the human activities and climate changes. can pose serious threats to the water resources, sustainable goods production and ecosystem. In this talk, we introduce challenges and opportunities of river basin management. We build a modified process-based model – Soil and Water Assessment Tool (SWAT) to quantify the impacts of climate change and agricultural activities on water quality. The SWAT model is then calibrated and validated using observed data (e.g., streamflow, sediment and temperature) in 1983-2013 with a high spatial resolution (25 km) daily future climate data. The results show that the modified model is able to capture the dynamics of water nutrients, such as dissolved oxygen, carbonaceous biochemical oxygen demand (cBOD), total nitrogen and phosphorus with a wide range of accuracy. Finally, we tested different alternative management options to compare water quality status of Athabasca River Basin (ARB) under changing climate. Significant reduction in future nutrients concentrations (~20% on nitrogen and 60% on phosphorous) can be achieved using an optimal combination of management practices and the ecological status of the basin can be improved. In the base period (1990-2005), agriculture areas (2662 gN/ha/yr) constituted the emission hot-spots. Spring season in agriculture area and summer season in forest area, constituted the emission hot-moments. Our results imply that the impacts of climate change on the cold watershed could be serious. The spatiotemporal variability of water quality will depend strongly on soil water changes due to permafrost thaw, and glacier retreat. Early snow freshet leads to spatial variability of soil erosion and nutrient runoff, and increased emission in winter and decreased emission in spring. This demonstrates that the results can help in agricultural and soil managing of the river basin in a more holistic way.