Prof. Chongxi Chen's academic research contributions in the area of hydrogeology

Significance Prof. Chongxi Chen has long been engaged in teaching courses, personnel training and scientific research in the field of hydrogeology, working diligently and innovatively, and has achieved fruitful academic research results. Progress This article makes a systematic review of Prof. Chongxi Chen's academic contributions in the field of hydrogeology, mainly including three aspects: ① Carrying out innovative and theoretical researchon groundwater hydraulics. He corrected the historical model error of "steady-state well flow within the influence radius", developed a series of analytical models for special hydrogeological problems, and improved and extended classical well flow models. ② Continuously exploring hydrogeological simulation methods. He proposed a number of techniques and methods to improve the emulational level of groundwater simulation, such as the equivalent submarine discharge boundary of coastal groundwater, the coupling seepage-pipe flow model, the linear-nonlinear flow model in triple Karst media of cave-fracture-porous and the groundwater withdrawal-land subsidence model, etc. He also developed a unique and advantageous software for groundwater flow simulation, PGMS. ③ Proposing a theory of recharge-discharge changes for the evaluation of the sustainable groundwater extraction. He completed groundwater modelling in several typical regions in China, which played a demonstration role for the scientific assessment of groundwater resources. Conclusions and Prospects Prof. Chongxi Chen's innovative research has played an important role in promoting the development of hydrogeology in China.