CHEN Yongqin David 陳永勤

Research Projects


  • Characterization and Estimation of Low Flows in the East River (Dongjian) Basin
  • CHEN Yongqin David
    11 November 2002
    CUHK Research Committee Funding (Direct Grants)

    Water resources in the East River basin have been highly developed and heavily committed for a variety of uses such as water supply, hydropower, navigation, irrigation, and suppression of seawater invasion. In recent years the East River provides supply to meet about 80% of Hong Kong annual water demands. Compared to flood problems and their associated hazards, which are often more visible and dramatic, fewer efforts have been devoted to study the occurrence, characteristics, estimation techniques and environmental and economic impacts of river low flows. However, low-flow conditions and hydrologic droughts are obviously very crucial to the reliability and vulnerability of the East River water resources systems to satisfy the multiple objectives of water uses. This study is therefore proposed to employ hydrologic analysis methods for low-flow characterization and estimation. Two techniques, frequency analysis and baseflow recession analysis, will be performed to characterize low flows in terms of minimum average-streamflow rates and the associated probability distributions. To estimate low-flow statistics at ungauged sties, this study will adopt a regional hydrologic modeling approach to developing statistical relationships (both ordinary regression and geographically weighted regression) between low-flow statistics at gauged sites and a number of drainage basin characteristics derived from maps and remote sensing images. This study will not only have treatments scientific merits, but also highly valuable practical significance and enormous relevance to Hong Kong. (SS02987)


  • Characterization of Low Flows for Water Resources Management in the East River (Dongjiang) Basin
  • CHEN Yongqin, David CHEN Min-jian*, FUNG Tung, LEUNG Yee, SHAO Quanxi*, XIA Jun*
    1 December 2003
    Research Grants Council (Earmarked Grants)

    Water resources in the East River basin have been highly developed and heavily committed for a variety of uses such as water supply, hydropower, navigation, irrigation, and suppression of seawater invasion. In recent years the East River provides supply to meet about 80% of Hong Kong’s annual water demands. Low-flow conditions and hydrologic droughts are obviously very crucial to the reliability and vulnerability of the East River water resources systems to satisfy the multiple objectives of water uses. This study is therefore proposed to employ hydrologic analysis methods for low-flow characterization and modeling techniques for optimization of water resources systems under low-flow conditions. This research will advance the state-of–the–art of low-flow hydrology through studies for developing and applying a variety of techniques and models (both statistical and analytical) to characterize and estimate low-flow regimes. Two techniques, frequency analysis and baseflow recession analysis, will be performed to characterize low flows in terms of minimum average-streamflow rates and the associated probability distributions. To estimate low-flow statistics at ungauged sited, this study will adopt a regional hydrologic modeling approach to developing statistical relationships (both ordinary regression and geographically weighted regression) between low-flow statistics at gauged sites and a number of drainage basin characteristics derived from maps and remote sensing images. Finally, impacts of low flows on water quality and other water uses will be assessed and, multi-objective programming techniques will be applied to optimize water resources systems for the formulation of management strategies and plans. This study will not only have tremendous scientific merits, but also highly valuable practical significance and enormous relevance to Hong Kong. (CU03247)



Research Publications


  • “Cross-basin Water Transfer and Water Supplies in Hong Kong.” Proceedings of UCOWR Annual Meeting on "Living Downstream in the Next Millennium: Reconciling Watershed Concerns with Basin Management", August 1-4, 2000. New Orleans: Mississippi State University and Louisiana State University, August 2000



  • "Long-Term Temporal-Spatial Dynamics of Marine Coastal Water Quality in the Tolo Habor, Hong Kong, China." (co-authored with Xu Fu-liu; Lam Kin Che; Dawson R. W. and Tao Shu) Journal of Environmental Sciences (Beijing, China: IOS Press) vol.16 no.1 (2004), pp.161-166
    (CUHK Library Call No: electronic resource ISSN: 1001-0742)



  • "Marine Coastal Ecosystem Health Assessment: A Case Study of the Tolo Harbour, Hong Kong, China." (co-authored with Xu F. L.; Lam Kin Che; Zhao Z. Y.; Zhan W.; and Tao S.) Ecological Modelling (Elsevier B.V.) vol.173 (2004), pp.355-370
    (CUHK Library Call No: electronic resource ISSN: 0304-3800)



  • "Restorating Marine Coastal Ecosystem Health as a New Goal for Integrated Catchment Management in Tolo Harbour, Hong Kong, China." (co-authored with Xu Fuliu; Lam Kin Che and Tao Shu) Chinese Journal of Population Resources and Environment (China) vol.2 no.2 (April 2004), pp.11-19
    (CUHK Library Call No: electronic resource ISSN: 1004-2849 ISBN/ISSN: 37-1202/N)



  • "Restoration of Marine Coastal Ecosystem Health as a New Goal for Integrated Catchment Management in Tolo Harbor, Hong Kong, China." (co-authored with Xu Fu-liu; Hao Jun-yi; Tao Shu; Dawson Richard W.; Lam Kin Che) Environmental Management (Springer Science Business Media, Inc.) vol.37 no.4 (6 Feb 2006), pp.540-552



  • "Sustainable Development and Management of Water Resources for Urban Water Supply in Hong Kong." Water International (USA: International Water Resources Association) vol.26 no.1 (Mar 2001), pp.119-128


* Name of external researcher
# Name of staff who has left the University