Influence of rainfall runoff with different intensities on thermal stratification and water quality of water source reservoir
HUA Feng-yao, HUANG Ting-lin, LI Nan, SI Fan, HUANG Cheng, ZHAO Ling-yun
Northwest Water Resources and Environmental Ecology Key Laboratory, Ministry of Education, Shaanxi Provincial Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
Abstract：Based on the rainfall-runoff and water quality data of Jinpen Reservoir in Xi'an from 2012 to 2019, indicators such as water temperature, turbidity, total nitrogen, total phosphorus and sand content were analyzed to comprehensively explore the infiltration process of rainfall-runoff with different intensities and its impact on thermal stratification and water quality of the water source reservoir. Research results show that different intensities of rainfall dive into the reservoir area at different locations. When the peak flow was less than 500m3/s, the density undercurrent entered the reservoir area from the upper thermocline; with peak inflow of 500~1500m3/s, the middle runoff was affected by the temperature and sediment concentration, whose diving point moved downward, entering the reservoir area in the form of interlayer flow in the middle; while the peak flow of the flood was over 1500m3/s, where the runoff was significantly affected by the sand content, entering the reservoir area in the form of underflow at the bottom, and the thickness of the intruding layer became larger. The effects of rainfall-runoff with different intensities on thermal stratification in the reservoir area were also different:small flow runoff had little impact; medium flow runoff would destroy the thermocline on the upper part of the water body, forming a thermocline with small temperature gradient at the bottom; while large flow runoff would completely renew and mix the water body, resulting in uniform water temperature in the middle and at the bottom, as well as transition from thermocline to constant temperature layer directly. Different inflow runoff, incoming water quality and intruding layer locations had different impacts on water quality of the main reservoir area. TN was mainly in dissolved state, accounting for more than 76%, while TP was mainly in granular state, accounting for 61%. When the inflow was low, the concentration of nitrogen and phosphorus in the upper thermocline was higher. With the increase of inflow and the scouring effect, the concentration of nitrogen and phosphorus in the intruding layer became higher. When the thermal stratification was broken, the concentration of the whole section increased obviously.
华逢耀, 黄廷林, 李楠, 司凡, 黄诚, 赵凌云. 不同强度降雨径流对水源水库热分层和水质的影响[J]. 中国环境科学, 2021, 41(3): 1234-1242.
HUA Feng-yao, HUANG Ting-lin, LI Nan, SI Fan, HUANG Cheng, ZHAO Ling-yun. Influence of rainfall runoff with different intensities on thermal stratification and water quality of water source reservoir. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(3): 1234-1242.
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