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.
苏露.金盆水库沉积物中磷的迁移转化规律及扬水曝气原位控制[D]. 西安:西安建筑科技大学, 2016. Su L.Fate of phosphorus in sediments of Jinpen Reservoir and its in-situ control using water lifting aerator[D]. Xi'an:Xi'an University of Architecture & Technology, 2016.
[2]
朱丹.黑河金盆水库水源地水环境调查和保护措施研究[D]. 西安:长安大学, 2014. Zhu D. Study on the pollution source situation and protection for urban drinking water sources-the Heihe Jinpen Reservoir[D]. Xi'an:Chang'an University, 2014.
[3]
李杨.分层型水源水库水温模拟及扬水曝气系统运行优化研究[D]. 西安:西安建筑科技大学, 2018. Li Y. Water temperature simulation of a stratified source water reservoir and optimal operation of water-lifting aerator system[D]. Xi'an:Xi'an University of Architecture & Technology, 2018.
[4]
解河海,张金良,郝振纯,等.水库异重流研究综述[J]. 人民黄河, 2008,30(5):28-30. Xie H H, Zhang J L, Hao Z C, et al. Overview of researches on density currents in reservoir[J]. Yellow River, 2008,30(5):28-30.
[5]
王雨春,朱俊,马梅,等.西南峡谷型水库的季节性分层与水质的突发性恶化[J]. 湖泊科学, 2005,(1):54-60. Wang C L, Zhu J, Ma M, et al. Thermal stratification and paroxysmal deterioration of water quality in a Canyon-Reservoir,Southwestern China[J]. Journal of Lake Sciences, 2005,(1):54-60.
[6]
黄廷林,曾明正,邱晓鹏.周村水库季节性热分层消亡期水质响应特性[J]. 环境工程学报, 2016,10(10):5695-5702. Huang T L, Zeng M Z, Qiu X P. Response of water quality of Zhoucun reservoir during the disappearance of seasonal thermal stratification[J]. Chinese Journal of Environmental Engineering, 2016,10(10):5695-5702.
[7]
吕晓龙,黄廷林,李楠,等.暴雨径流潜流过程及其对分层水库水质的影响[J]. 中国环境科学, 2019,39(7):3064-3072. Lü X L, Huang T L, Li N, et al. Impact of stormwater inflow on water quality of stratified source reservoir[J]. China Environmental Science, 2019,39(7):3064-3072.
[8]
连心桥,朱广伟,杨文斌,等.强降雨对平原河网区入湖河道氮、磷影响[J]. 环境科学, 2020,41(11):4970-4980. Lian X Q, Zhu G W, Yang W B, et al. Effect of heavy rainfall on nitrogen and phosphorus concentrations in rivers at river-net plain[J]. Environmental Science, 2020,41(11):4970-4980.
[9]
李晓虹,雷秋良,周脚根,等.降雨强度对洱海流域凤羽河氮磷排放的影响[J]. 环境科学, 2019,40(12):5375-5383. Li X H, Lei Q L, Zhou J G, et al. Effect of rainfall intensity on the content of nitrogen and phosphorus components in plateau areas:A case study of the Fengyu River Watershed[J]. Environmental Science, 2019,40(12):5375-5383.
[10]
余伟宾.分层水库异重流数值模拟及水质响应预测[D]. 西安:西安建筑科技大学, 2018. Yu W B. Numberical simulation of density currents in thermally stratified reservoir and water quality prediction[D]. Xi'an:Xi'an University of Architecture & Technology, 2018.
[11]
Wei L, Jiang D, Tao C. Effects of flood on thermal structure of a stratified reservoir[J]. Procedia Environmental Sciences, 2011, 10(Part B):1811-1817.
[12]
任实.温度分层水库中密度流运动特性研究[D]. 武汉:武汉大学, 2016. Ren S. Investigation of density current in thermal stratified reservoir[D]. Wuhan:Wuhan University, 2016.
[13]
曾康.降雨径流对大水深分层型水库水质的影响[D]. 西安:西安建筑科技大学, 2016. Zeng K. The effects of rainfall runoff on water quality of a stratified deep reservoir[D]. Xi'an:Xi'an University of Architecture & Technology, 2016.
[14]
黄诚,黄廷林,李扬,等.金盆水库暴雨径流时空演变过程及水质评价[J/OL]. 环境科学:1-13[2020-12-14].https://doi.org/10.13227/j.hjkx.202007180. Huang C, Huang T L, Li Y, et al. Temporal and spatial evolution of storm runoff and water quality assessment in Jinpen Reservoir[J/OL]. Environmental Science:1-13[2020-12-14].https://doi.org/10.13227/j.hjkx.202007180.
[15]
国家环境保护总局.水和废水监测分析方法(第四版)[M]. 北京:中国环境科学出版社, 2002. The State Environmental Protection Administration The Water and Wastewater Monitoring Analysis Method Editorial Board. Water and wastewater monitoring analysis method[M]. 4th Edition. Beijing:China Environmental Science Press, 2002.
[16]
程忠良,刘勇,高成,等.基于马氏距离判别的丹江口水库长期径流分级预报[J]. 中国农村水利水电, 2018,(7):1-4. Cheng Z L, Liu Y, Gao C, et al. Long-term runoff classification forecast of Danjiangkou Reservoir based on Mahalanobis distance discrimination[J]. China Rural Water and Hydropower, 2018,(7):1-4.
[17]
马卫星.暴雨径流潜流对峡谷分层型水源水库水质影响与水质原位改善[D]. 西安:西安建筑科技大学, 2015. Ma W X. The effects of rainstorm flow undercurrent on water quality and the in-situ water quality improvement of a canyon-shaped, stratified, source water reservoir[D]. Xi'an:Xi'an University of Architecture & Technology, 2015.
[18]
黄俊,张旭,彭炯,等.暴雨径流污染负荷的时空分布与输移特性研究[J]. 农业环境科学学报, 2004,(2):255-258. Huang J, Zhang X, Peng J, et al. Temporal and spatial distribution and transportation of nitrogen and phosphorus in stormwater runoff[J]. Journal of Agro-Environment Science, 2004,(2):255-258.
[19]
陆海明,张丽,王妞,等.降雨径流对江淮丘陵区农业流域磷素输出影响研究[J]. 农业环境科学学报, 2019,38(9):2165-2173. Lu H M, Zhang L, Wang N, et al. Impact of rainfall-runoff on phosphorus export from an agriculture watershed in the hilly region of Yangtze Huaihezone, China[J]. Journal of Agro-Environment Science, 2019,38(9):2165-2173.
[20]
张俊华,李涛,马怀宝.小浪底水库调水调沙研究新进展[J]. 泥沙研究, 2016,(2):68-75. Zhang J H, Li T, Ma H B. Proceedings on water and sediment regulation in Xiaolangdi Reservoir[J]. Journal of Sediment Research, 2016,(2):68-75.
[21]
解岳,陈恩源,孙昕.分层水库异重流挟沙特性及适宜排沙口的确定[J]. 中国给水排水, 2017,(5):108-112. Xie Y, Chen E Y, Sun X. Characteristics of transporting sediment by density currents and determination of proper location of sediment releasing outlet in stratified Reservoir[J]. CHINA WATER & WASTEWATER, 2017,(5):108-112.
[22]
Parker G, Toniolo H. Note on the analysis of plunging of dentisy flows[J]. Journal of Hydraulic Engineering, 2007,133(6):690-694.
[23]
黄廷林,谭欣林,李扬,等.金盆水库热分层特性及扬水曝气系统运行效果研究[J]. 西安建筑科技大学学报(自然科学版), 2018, 50(2):270-276,284. Huang T L, Tan X L, Li Y, et al. Study of the thermal regime characteristics and effect of water-lifting aerators operation on the Jinpen Reservoir[J]. Journal of Xi'an University of Architecture & Technology (Natural Science Edition), 2018,50(2):270-276,284.
[24]
Monika W, Daniel E S. Climate change uncouples trophic interaction in an aquatic ecosystem[J]. Ecology, 2004,85(8):2100-2106.
[25]
Liu W, Jiang D G, Cheng T. Effects of Flood on Thermal Structure of a Stratified Reservoir[J]. Procedia Environmental Sciences, 2011,10:1811-1817.
[26]
Wang S, Qian X, Han B P, et al. Effects of local climate and hydrological conditions on the thermal regime of a reservoir at Tropic of Cancer, in southern China[J]. Water Research, 2012,46(8):2591-2604.
[27]
曾立雄,肖文发,黄志霖,等.三峡库区兰陵溪小流域养分流失特征[J]. 环境科学, 2013,34(8):3035-3042. Zeng L X, Xiao W F, Huang Z L, et al. Characteristics of nutrient loss of Lanlingxi Watershed in the Three Gorges Reservoir Area[J]. Environmental Science, 2013,34(8):3035-3042.
[28]
杨帆,蒋轶锋,王翠翠,等.西湖龙泓涧流域暴雨径流氮磷流失特征[J]. 环境科学, 2016,37(1):141-147. Yang F, Jiang Y F, Wang C C, et al. Characteristics of Nitrogen and Phosphorus Losses in Longhong Ravine Basin of Westlake in Rainstorm Runoff[J]. Environmental Science, 2016,37(1):141-147.
[29]
Marti C L, Mills R, Jörg Imberger. Pathways of multiple inflows into a stratified reservoir:Thomson Reservoir, Australia[J]. Advances in Water Resources, 2011,34(5):551-561.
[30]
卢金锁,李志龙.热分层对水库水质的季节性影响——以西安黑河水库为例[J]. 湖泊水库, 2014,26(5):698-706. Lu J S, Li Z L. Seasonal effects of thermal stratification on the water quality of deep reservoirs:A case study of Heihe Reservoir,Xi'an City[J]. Journal of Lake Sciences, 2014,26(5):698-706.
[31]
Ma W X, Huang T L, Li X, et al. The effects of storm runoff on water quality and the coping strategy of a deep canyon-shaped source water reservoir in China[J]. International Journal of Environmental Research & Public Health, 2015,12(7):7839-7855.
[32]
曾康,黄廷林,马卫星,等.金盆水库汛期高浊水径流的潜入及热分层水体水质响应[J]. 中国环境科学, 2015,35(9):2778-2786. Zeng K, Huang T L, Ma W X, et al. Water-quality responses of the intrusion of high-turbidity runoff to the thermal stratified Jin-pen Reservoir during flood season[J]. China Environmental Science, 2015,35(9):2778-2786.
[33]
Zhang Y L, Wu Z X, Liu M L, et al. Dissolved oxygen stratification and response to thermal structure and long-term climate change in a large and deep subtropical reservoir (Lake Qiandaohu, China)[J]. Water Research, 2015,75:249-258.
[34]
邓立凡,黄廷林,李楠,等.水源水库暴雨径流过程水体锰的迁移及其影响[J]. 环境科学, 2019,40(6):2722-2729. Deng L F, Huang T L, Li Nan, et al. Migration characteristics of manganese during rainfall events and its impacts on water quality in a drinking water source reservoir[J]. Environmental Science, 2019, 40(6):2722-2729.
[35]
Peraza-Castro M, Sauvage S, Sánchez-Pérez J M, et al. Effect of flood events on transport of suspended sediments, organic matter and particulate metals in a forest watershed in the Basque Country (Northern Spain)[J]. Science of the Total Environment, 2016, (569-570):784-797.