Xia Jun

Xia Jun

Xia Jun, male, academician of Chinese Academy of Sciences, Professor of Wuhan University and President of Institute of water safety. He was born in 1954 in Hubei Province. He graduated from Wuhan University of water resources and electric power in 1976, and received a doctor's degree in hydrology and water resources in 1985. He was the chief scientist of the national 973 project and the director of the State Key Laboratory of water resources and Hydropower Engineering Science (Wuhan University). He was elected academician of the Chinese Academy of Sciences in 2015.

He has been engaged in hydrology and water resources research for a long time. He discovered for the first time the time-varying gain runoff generation law controlled by soil moisture, rainfall intensity and underlying surface multi factor combination, and revealed the hydrological nonlinear mechanism of runoff formation and transformation. Systematic research results have been obtained in the time-varying nonlinear theory and practice of runoff formation and transformation, which have been applied to the Yangtze River, Yellow River, Huaihe River and other basins in China, as well as the northwest region and cities for flood control and disaster reduction, water management of major water projects to deal with climate change, and water system construction of sponge cities, resulting in significant social and economic benefits.

More than 150 SCI papers and 160 EI papers have been published, and 12 monographs have been published. He was elected president of IWRA in 2009. At present, he is the chairman of the China Committee of the International Union of Geodesy and Geophysics (IUGG), member of the Executive Board of IUGG, vice chairman of the Geographical Society of China, vice chairman of the natural resources society of China, and director of the water resources research center of the Chinese Academy of Sciences. He won the second prize of National Natural Science Award in 2017. Internationally, he won the "outstanding contribution award of international water resources management" in 2011, the highest award in the field of international hydrological science "International Hydrological Science Award (IHP volkermedal)" in 2014, the honor of "fellow" of "International Union of Geodesy and Geophysics (IUGG)" in 2019, and was evaluated as "outstanding contribution in the development of hydrological science and international cooperation, He also applied his research and knowledge of hydrology to benefit the society.

Educational experience

work experience

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Achievements and contributions

Hydrological science is one of the important branches of Earth Science and the scientific basis of sustainable water management, involving global change, water cycle, sustainable utilization of water resources, economic and social development and other fields. Professor Xia Jun has been engaged in the research of hydrology and water resources for a long time, especially in the basic research and application practice of water science of non-linear system theory of hydrology and water environment, water ecology and water management related to water cycle. He has made systematic achievements with international influence, and has long been committed to promoting the development of global hydrological science and actively carrying out international cooperation and application. In 2014, IAHS, UNESCO and WMO jointly awarded him the highest award in the field of International Hydrological Science: International Hydrological prize Volker medal; in 2019, IUGG awarded him the honor of IUGG member; and he was evaluated as a member of the International Union of Geodesy and Geophysics (IUGG)“

Xia Jun made outstanding contributions to the development of hydrological science and international cooperation, and applied his research and hydrological knowledge to benefit the society

”。 The main academic achievements are summarized as follows

1. Innovate the theory and method of hydrological time-varying gain nonlinear system, reveal the time-varying nonlinear mechanism of runoff formation and transformation, and promote the basic research of hydrological science application, which is an important engine of social and economic sustainable development

Hydrology and its related water science is an important scientific basis for linking Natural Science with social and economic development, involving water cycle changes and water security issues of urban system, river system, river basin system and global water system. Runoff formation and transformation under changing environment is the key to the management and scientific operation of complex socio-economic systems such as urban agglomerations and large watersheds. Due to the special effects of global change and the inherent spatiotemporal variability of hydrology, as well as the complexity of runoff formation and transformation process related to complex topography, so far, there are still many simplifications and assumptions in the theory and method of quantitative calculation and prediction of runoff change caused by rainfall. The International Association of Hydrological Sciences (IAHS) and the World Meteorological Organization (WMO) urgently need to improve the theory and method of hydrology, especially the law and understanding of the formation and transformation of watershed runoff under high intensity rainstorm and flood and changing environmental system. Since the 1970s, Xia Jun has paid attention to the complex hydrological nonlinear phenomena and carried out in-depth research, especially seizing the lack of linear hydrological theory reflected by the major disaster of Banqiao reservoir dam collapse caused by the "75.8" Torrential Rain and flood in China and the opportunity of comparative study of international hydrological forecast, constantly verifying, enriching and applying the proposed theory, and achieved internationally recognized results: (1) The theory and method of nonlinear hydrological system identification are innovated. In this paper, a new approach of hydrologic modeling is proposed, in which the orthogonal function set approximates the nonlinear response function and is coupled with the hydrologic physical constraints. It solves the problem of high-dimensional variable inversion in identifying the nonlinear response law of rainfall runoff, and establishes the nonlinear contribution of watershed hydrologic response and its relationship and transformation with linear response A new time-varying gain mechanism is formed and transformed. Based on the identification of the relationship between the massive data and the response of the global representative watershed, the nonlinear law of time-varying runoff yield controlled by the combination of soil moisture, rainfall intensity and underlying surface was found, and the calculation formula of watershed runoff yield was constructed. This study improves the deficiency of assuming that the runoff yield gain is constant and only average in the original hydrological linear theory, makes it difficult for the internationally recognized hydrological nonlinear response function to be solved, and greatly improves the accuracy of runoff prediction. Verified by more than 60 representative watersheds in different climate regions of the world, the prediction accuracy is 63% higher than that of linear theory, with an average increase of 45%; (3) the nonlinear theory and method system of hydrological system is developed. The relationship between rainfall and runoff is extended to the basin water cycle. The nonlinear response law of hydrological phenomena, the principle, model, method and application of hydrological nonlinear analysis are expounded. The monograph of hydrological nonlinear theory is formed systematically. The internationally influential linear theory of hydrological system is promoted to a new height of nonlinear theory of hydrological system. Professor Xia Jun's research has promoted the understanding of the scientific basis of water system for global change water resources management, and laid a foundation for sustainable water use and integrated water management. In 2014, Professor Xia Jun was jointly awarded the international hydrology prize Volker medal by the International Association for Hydrological Sciences (IAHS), the United Nations Educational, scientific and Cultural Organization (UNESCO) and the World Meteorological Organization (WMO)“

Professor Xia Jun is an outstanding scientist. He has made innovative contributions to the development of knowledge and strategy of hydrological science and practice, and the application of water management and sustainable development in China and the world, and has had an important impact on the international community. He developed the nonlinear time-varying system hydrology approach, which promoted the basic research of hydrological science of water resources management as the engine of social and economic sustainable growth

”。

2. Developed the water system theory and distributed time-varying gain model and parameter identification method of multi process coupling and decoupling of water quantity, water quality and water ecology of river basin and city, and applied them to water supply, flood control, water environment treatment, ecological protection and water resources comprehensive management of river basin and city under the influence of global change, resulting in outstanding social, economic and environmental benefits

Under the influence of climate change and high-intensity human development activities, the economic development and protection of China's major river basins, water security, environmental governance and ecological protection of sponge city construction are all faced with the application and decision support problems of comprehensive management and control and system analysis of "water and climate, water and environment, water and ecology, water and society". Based on the principle of hydrological nonlinear system analysis, Professor Xia Jun further developed the method of distributed time-varying gain model of watershed, proposed the parameter identification method of water cycle system coupling the underlying surface type of watershed, reservoir gate dam and water diversion project, industrial and agricultural water intake and water quality process, established the relationship between time-varying runoff coefficient and underlying surface change of watershed, and solved the problem of runoff under complex conditions Some problems of simulation. On this basis, the urban water system version 5.0 is refined and developed, and a multi process coupling water system theory and integrated simulation method (such as Yangtze River simulator) based on distributed water cycle process and time-varying nonlinear model is established for the comprehensive management of Huaihe River, Yellow River and Yangtze river basins. Combined with social and economic factors, it has been applied to the evaluation of water resources and environment carrying capacity, adaptive management and comprehensive management of urban water system and river basin to cope with environmental changes, and developed relevant water system analysis tools to process data assimilation and risk reduction information. The results have been applied to the joint operation of flood control and pollution prevention and major water diversion projects, and have produced outstanding benefits and impacts: (1) it has been applied to the flood forecast and flood control and disaster reduction of reservoirs and basins in the Yellow River, Huaihe River, Yangtze River, Hubei Province, Shandong Province and Yunnan Province, especially in the prediction and parameter identification of mountain torrents in small and medium-sized rivers, which has been recognized by the basin management institutions and hydrological peers, and has been approved by the Ministry of water resources Provincial and ministerial level (2004) and National Natural Science Award (2017); (2) applied to flood control and pollution prevention of multi dam rivers in Huaihe River Basin

Chinese PinYin : Xia Jun1