（1）Environmental hydrogeochemistry

（2）Environmental and ecological hydrology

(1) Water environmental protection

(2) Environmental hydraulics

1、The General Program of The National Natural Science Foundation of China, 42377073, Phosphate oxygen isotope tracing technique and application in the lake and river system of Taihu Basin, 2024.01-2027.12, under research, program leader.

2、The General Program of The National Natural Science Foundation of China, 42077165, Research of antibiotic resistance genes migration and accumulation in riverbank system with different porous medium, 2021.01-2024.12, under research, program leader.

3、National Major Science and Technology Program for Water Pollution Control and Treatment, 2017ZX07602.003, Research on differentiated water quality target management and the construction of multi-objective intelligent management platform in Shaying River Basin, 2017.01-2021.06, program leader.

4、The Key Program of The National Natural Science Foundation of China, 41230640, Mechanism of nitrogen accumulation and regulation for the river network region in Yangtze River Delta under human activities, 2013.01-2017.12, program leader.

5、National Major Science and Technology Program for Water Pollution Control and Treatment, 2014ZX07204-005-5, Integrated technology and application of multi-objective management for water quality improvement of heavily polluted river in the downstream of Huaihe River, 2014.01-2016.12, program leader.

6、National Major Science and Technology Program for Water Pollution Control and Treatment, 2012ZX07204-003, Research and demonstration of key technology for supplementation, drainage and control of surface water and groundwater nitrogen sources in the Huaihe River Basin, 2012.01-2015.12, program leader.

7、National High-tech R&D Program (863 Program), 2003AA601070, Research on anaerobic ammonia oxidation control technology of shallow groundwater nitrogen pollution in Yangtze River Delta, 2008.10-2012.06, program leader.

8、National Major Science and Technology Program for Water Pollution Control and Treatment (Sub-program), Key technology research and engineering demonstration of multi-ecological water quality improvement and functional enhancement in in urban mildly polluted landscape river, 2009.02-2012.12, program leader.

9、National Major Science and Technology Program for Water Pollution Control and Treatment (Sub-program), Research on key technologies for water pollution control and treatment and construction of a comprehensive management platform in the Huaihe River Basin, 2009.02-2011.12, program leader.

10、National Major Science and Technology Program for Water Pollution Control and Treatment (Sub-program), Identification of key issues and optimal management techniques for non-point source pollution control in typical areas of Shaying River basin, 2009.01-2011.12, program leader.

11、Department of Ecology and Environment of Jiangsu Province, Ecological and environmental research program, Multi-isotope tracing of nitrogen and phosphorus and its application in river-lake system of Taihu Lake basin, 2022.09-2024.08, under research, program leader.

12、Science and Technology Program of Water Resources Department of Jiangsu Province, Typical demonstration study on water quality target management in water functional area of Changshu city, 2018.01-2018.12, program leader.

13、Huaian Water Conservancy Bureau, Urban flood control, waterlogging planning and water quality-water quantity model in Huai'an city, 2022.06-2023.05, program leader.

Representative academic articles

1、Jiefu Yao, Baoju Li, Zihao Liu, Shuai Chen, Xiaohong Ruan(*). Explainable deep learning for dual goals: Predicting total phosphorus concentrations and identifying pollution sources in a tidal river network. Journal of Hydrology. 2025. DOI10.1016/j.jhydrol.2025.134203

2、Ziwei Wang, Fan Le, Shuai Chen, Tong Chen, Xiaohong Ruan(*). Multi-element coupling effect of nitrogen cycling in an intensively dam-controlled river system. Journal of Hydrology. DOI 10.1016/j.jhydrol.2024.132648

3、Tong Chen, Ziwei Wang, Xiaohong Ruan(*). Antibiotic resistome dynamics in agricultural river systems: Elucidating transmission mechanisms and associated risk to water security. Science of The Total Environment. 2024. DOI: 10.1016/j.scitotenv.2024.175580.

4、Fan Le, Xiaohong Ruan(*), Zhao Wei, Kedi Wu, Haizhen Wei, Congqiang Liu. Tracing phosphorus sources in the river-lake system using the oxygen isotope of phosphate. Science of The Total Environment. 2024, 949. DOI: 10.1016/j.scitotenv.2024.175022.

5、Jiefu Yao, Shuai Chen, Xiaohong Ruan(*). Interpretable CEEMDAN-FE-LSTM-transformer hybrid model for predicting total phosphorus concentrations in surface water. Journal of Hydrology. 2024, 629. DOI: 10.1016/j.jhydrol.2024.130609.

6、Ziwei Wang,  Xiaohong Ruan(*), Rongfu Li, Yaping Zhang. Microbial interaction patterns and nitrogen cycling regularities in lake sediments under different trophic conditions. Science of The Total Environment. 2024, 907. DOI: 10.1016/j.scitotenv.2023.167926.

7、Huifeng Li, Shuai Chen, Xiaohong Ruan(*). Differences in nonpoint source pollution load losses based on hydrological zone characteristics: a case study of the Shaying River Basin, China. Environmental Science and Pollution Research. 2023, 30(54): 115950-115964.

8、Shuai Chen, Xiaohong Ruan(*). A hybrid Budyko-type regression framework for estimating baseflow from climate and catchment attributes. Journal of Hydrology, 2023, 618: 129118.

9、Fan Le, Rongfu Li, Xiaohong Ruan(*), Congqiang Liu. Isotopic tracing of nitrogen source and interaction between surface water and groundwater of a small valley plain in the Zhangxi watershed. Applied Geochemistry, 2023, 151: 105615.

10、Shuai Chen, Xiaohong Ruan(*). Annual nitrate load patterns in an agricultural watershed in consecutive dry years. Hydrology Research, 2021, 52(4): 847-863.

11、Huifeng Li, Shuai Chen, Tianhai Ma, Xiaohong Ruan(*). The quantification of the influencing factors for spatial and temporal variations in surface water quality in recent ten years of the Huaihe River Basin, China. Environmental Science and Pollution Research, 2022.

12、Tianhai Ma, Ying Bai and Xiaohong Ruan(*). Soil phosphorus composition, loss risk and contribution to the aquatic environment in a typical agricultural area. Water Quality Research Journal, 2021, 56(2): 111-125.

13、Rongfu Li, Xiaohong Ruan(*) et al. In-situ nitrogen fate in the vadose zone of different soil types and its implications for groundwater quality in the Huaihe River Basin, China. Acta Geochimica, 2020, 39(3): 281-290.

14、Wen Zhang, Ying Bai, Xiaohong Ruan(*) et al. The biological denitrify-cation coupled with chemical reduction for groundwater nitrate remediation via using SCCMs as carbon source. Chemosphere, 2019, 234: 89-97.

15、Yu Wan, Xiaohong Ruan(*) et al. Spatial and Seasonal Variations in the Abundance of Nitrogen-Transforming Genes and the Microbial Community Structure in Freshwater Lakes with Different Trophic Statuses. International Journal of Environmental Research and Public Health, 2019, 16(3): 2298.

16、Yaping Zhang, Xiaohong Ruan(*) et al. Changes in the nitrogen biogeochemical cycle in sediments of an urban river under different dissolved oxygen levels. Water Science & Technology:Water Supply, 2019, 19(4): 1271-1278.

17、Zhongyue Yan, Jing Xu, Xiaohong Ruan(*). An improved source apportion-ment mixing model combined with a Bayesian approach for nonpoint source pollution load estimation. Hydrology Research, 2019, 50(3): 849-960.

18、Ying Bai, Xiaohong Ruan(*) et al. Antibiotic resistome profile based on meta-genomics in raw surface drinking water source and the influence of environ-mental factor: A case study in Huaihe River Basin, China. Environmental Pollution, 2019, 248: 438-447.

19、Ying Bai, Xiaohong Ruan(*) et al. Sulfonamides removal under different redox con-ditions and microbial response to sulfonamides stress during riverbank filtration: A laboratory column study. Chemosphere, 2019, 220: 668-677.

20、Wen Zhang, Xiaohong Ruan(*) et al. The characteristics and performance of sustainable-releasing compound carbon source material applied on ground-water nitrate in-situ remediation. Chemosphere, 2018, 205: 635-642.

21、Ying Bai, Xiaohong Ruan(*) et al. Residues of organochlorine pesticides (OCPs) in aquatic environment and risk assessment along Shaying River, China. Environmental Geochemistry and Health, 2018, 40(6): 2525-2538.

22、Wen Zhang, Xiaohong Ruan(*) et al. The characteristics and performance of sustainable-releasing compound carbon source material applied on groundwater nitrate in-situ remediation. Chemosphere, 2018, 205: 635-642.

23、Zharong Pan, Xiaohong Ruan(*) et al. Spatio-temporal variability of streamflow in the Huaihe River basin, China: climate variability or human activities? Hydrology Research, 2018, 49(1): 177-193.

24、Yu Wan, Ying Bai, Jia He, Yaping Zhang, Rongfu Li, Xiaohong Ruan(*). Temporal and spatial variations of aquatic environmental characteristics and sediment bacterial community in five regions of Lake Taihu. Aquatic Ecology, 2017, 51:343-358.

25、Rongfu Li, Xiaohong Ruan(*), Ying Bai, Tianhai Ma, Congqiang Liu. Effect of wheat-maize straw return on the fate of nitrate in groundwater in the Huaihe River Basin, China. Science of The Total Environment, 2017, 592: 78–85.

26、Yu Wan, Xiaohong Ruan(*). Illumina sequencing-based analysis of sediment bacteria community in different trophic status freshwater lakes. Microbiology Open, 2016, e00450.

27、Yaping Zhang, Xiaohong Ruan(*), Yu Wan et al. Analysis of Anammox bacterial community structure and environmental parameters from sediment samples of Lake Yangcheng in the Yangtze River Delta. Geomicrobiology Journal, 2016, 33(6): 479-487.

28、Yu Wan, Xiaohong Ruan(*) et al. Odour emission characteristics of 22 recreational rivers in Nanjing. Environmental Monitoring and Assessment, 2014, 186(10): 6061-6081.

29、Nan Shan, Xiaohong Ruan(*) et al. Modelling the optimal width of buffer strip for nonpoint source pollution control in the Three Gorges Reservoir Area, China. Ecological Modelling, 2014, 276:51-63.

30、Jing Ao, Xiaohong Ruan(*) et al. Distribution, Sources and ecological risks of polycyclic aromatic hydrocarbons in an urban landscape river. Water science and technology, 2012, 66(5): 934-941.

31、Weibo Lin, Yigang Wang, Xiaohong Ruan et al. Modeling Residual Circulation and Stratification in Oujiang River Estuary, China. Ocean Engineering, 2012, 26(2): 351-362.

32、Jing Xu, Liliang Ren, Xiaohong Ruan et al. Development of a physically based PDSI and its application for assessing the vegetation response to drought in northern China. Journal of Geophysical Research-Atmosphere. 2012, 117.

33、Zarong Pan, Xiaohong Ruan(*), Jing Ao. Application of 3S technology in the study of instream habitat assessment. 2012 2nd International Conference on Remote Sensing, Environment and Transportation Engineering.

34、Xiaohai Zhou, Xiaohong Ruan(*), Zharong Pan. The use of multivariate statistical techniques for hydrogeochemical study in Suzhou, China. EPPH2010, Chengdu, 2010.6.

35、Xiaodan Shi, Xiaohong Ruan(*). Distribution of Silicon and Its Effect on the Phytoplankton Community Structure in the Lake Ecosystem. 第十三届世界湖泊大会, 武汉, 2009: 268-269.

36、Xiaohai Zhou, Xiaohong Ruan(*), Zharong Pan. Application of factor analysis in the assessment of groundwater quality in Suzhou, China. 2nd ISASWR•LCE, 2009.12.

37、Ying Zhang, Xiaohong Ruan(*) et al Diversity and abundance of aerobic and anaerobic ammonium-oxidizing bacteria in freshwater sediments of the Xinyi River (China), Environmental Microbiology, 2007, 9 (9): 1462-2962.

38、Xiaohong Ruan, Yuqun Xue, Jianqiang Wu, Lixiao Ni, Min Sun, Xudong Zhang. Treatment of polluted river water using pilot-scale constructed wetlands. Bulletin of Environmental Contamination and Toxicology, 2006, 76(1).

39、Junying Chen, Yahui Zhang, Jiqiang Yang, Yanpeng Wang, Shuqing An, Xiaohong Ruan(*). Adjustment of water function zone adjustment based on water-quality target management. Journal of Nanjing University (Natural Science), 2022, 58(2): 235-245. (in Chinese)

40、Yi Shen, Tianhai Ma, Zhongyue Yan, Yahui Zhang, Xiaohong Ruan(*). TMDL for toxic pollutants and its emission limit practice in river systems based on reduction rate method. Journal of Nanjing University (Natural Science), 2021, 57(3): 437-444. (in Chinese)

41、Lingling Wu, Zhongyue Yan, Xiaohong Ruan(*). New method for ecological water level calculation based on improved Tennant method. Yangtze River, 2019, 50(5): 47-51. (in Chinese)

42、Fan Le, Rongfu Li, Tianhai Ma, Zhongyue Yan, Xiaohong Ruan(*). Analyses of isotopic characteristics and transformations of nitrogen in the runoff of sub-catchments with various land uses. Journal of Nanjing University (Natural Science), 2019, 55(2): 301-308. (in Chinese)

43、Wenli Shi, Rudong Jiang, Tianhai Ma, Xiaohong Ruan(*) et al. Molecular ecological network analysis of sedimental microbial community and its response to environmental factors in different trophic status areas of Taihu Lake. Journal of Nanjing University (Natural Science), 2018, 54(5): 1045-1056. (in Chinese)

44、Honhyu Zeng, Xiaohong Ruan(*) et al. The Comparison of the Application r-IPT_ra and r-IPT_V in the Research of Nitrogen Loss Rates in Freshwater Sediments. Geological Reviews. 2018, 64(1): 141-148. (in Chinese)

45、Huan Chen, Yaping Zhang, Xiaohong Ruan(*). Effect of Fe²⁺ on nitrate reduction using zero-valent iron. Geological Journal of China Universities, 2018, 24(1): 109-115. (in Chinese)

46、Qingle Wu, Xiaohong Ruan(*) et al. Analyses of sources and transformation of nitrogen as a contaminant in the river and lake water in the western region of the Taihu Lake basin. Acta Scientiae Circumstantiae, 2015, 35(12): 3883-3889. (in Chinese)

47、Zharong Pan, Xiaohong Ruan(*). Spatio-temporal analysis of satisfactory degree of ecological water demand in Huaihe River Basin. Journal of Hydraulic Engineering, 2015, 46(3): 280-290. (in Chinese)

48、Zharong Pan, Xiaohong Ruan(*) et al. A new calculation method of instream basic ecological water demand. Journal of Hydraulic Engineering, 2013, 44(1): 119-126. (in Chinese)

49、Nan Shan, Xiaohong Ruan(*) et al. Research advances in optimized design of water ecological shelter zones width. Advances in Water Science, 2012, 23(4): 581-589. (in Chinese)

50、Yanan Xing, Xiaohong Ruan(*) et al. Effect of environmental changes on nitrogen release from sediments in polluted urban river. Advances in Water Science, 2010, 21(1): 120-126. (in Chinese)

Patents

1、A permeable reaction wall for the treatment of nitrogen pollution in shallow groundwater and its construction method. (ZL201611068540.9)

2、A functional composite material for simultaneous removal of nitrogen and phosphorus and itspreparation method. (CN202010010835.0)

3、An in situ remediation method by functional biological fixation for groundwater nitrogen contamination. (ZL201010167301.5)

4、Alternate combined wetland system and efficient removal of nitrogen and phosphorus from urban tailwater. (ZL201010224776.3)

5、A groundwater nitrogen immobilization remediation filter material and itspreparation method. (ZL201110001391.5)

6、A slow-release carbon source materials for contaminated groundwater bioremediation and itspreparation method. (ZL201110423562.3)

7、A slow-release oxygen material for groundwater remediation and itspreparation method. (ZL201110426869.9)

8、An in situ remediation method for sediment nitrogen-nutrient contamination. (ZL201210502673.8)

9、A covering material for in-situ remediation of nitrogen immobilization in sediment and itspreparation method. (ZL201210206786.3)

10、A slow-release carbon source filler for carbon iron microbattery and itspreparation method. (ZL201310727268.0)

11、A determination method for the non-point source pollution load in sub-humid area watershed. (ZL201210148635.7)

12、A filling material and system of permeable reaction wall for the biological removal of groundwater nitrate and its filling method. (ZL201410441671.1)

13、A TMDL simulation method based on surface-groundwater coupling(202111220457.X) (To be authorized)

(1) 2025 Environmental Protection Science and Technology Award, Key Technologies and Applications of Integrated Management and Prevention-Control of Nitrogen Pollution in Watershed Surface Water and Groundwater, First Prize for Advances in Science and Technology, ranked first.

(2) The integrated control technology for agricultural non-point source nitrogen pollution in surface water and groundwater developed was included in the 2019 National Catalogue of Advanced Pollution Prevention and Control Technologies (Water Pollution Prevention and Control Field).

(3) Water Conservancy Science and Technology Award, provincial and ministerial level, key technologies and demonstrations of biological and ecological technology for controlling polluted water, second prize, ranked eighth in 2006.

(4) Jiangsu Provincial Science and Technology Progress Award, provincial and ministerial level, research on theoretical methods and applied technologies for water resources protection, first prize, ranked sixth in 2002.

(5) Science and Technology Progress Award of the Ministry of Water Resources of the People's Republic of China, provincial and ministerial level, study on the migration and transformation of pollutants after discharge into rivers, second prize, ranked fifth in 1996.

Group activity