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Development of Technique for Evaluating Streamflow Depletion in the Urbanized Small and Midium Watershed

  • Crisisonomy
  • Abbr : KRCEM
  • 2012, 8(6), pp.51-65
  • Publisher : Crisis and Emergency Management: Theory and Praxis
  • Research Area : Social Science > Public Policy > Public Policy in general

전상미 1 Park,Jae-Hyeon 1 Park, Chang-kun 2

1인제대학교
2관동대학교

Accredited

ABSTRACT

Small & medium-sized urban streams, in line with the changes to the characteristics of hydraulic factors such as increasing use of stream water and groundwater near the river or stream and variation in land use, has been suffering streamflow depletion, making it worse the healthy environment of the river. This study is intended to evaluate the hydraulic factors influencing on streamflow depletion so as to propose the quantified evaluation indicators which will enable to easily evaluate the degree of streanflow depletion. To that end, Namcheon where the streamflow depletion has been accelerated due to increase in impervious area ratio and groundwater use in line with urbanization. Analysis of discharge duration curve by subwater shed which was developed using SWMM_GE program which is the long-term flow program using hydraulic data for the regions and integrating the groundwater level and stream river level based on rainfall data for past 10 years. To evaluate the effect on streamflow depletion by cause, flow variation characteristics by hydraulic factor was analyzed and for evaluating the degree of ongoing streamflow depletion, a quantified standard flow based on mean drought flow before urbanization was proposed. In the wake of applying such indicators to the regions, Namcheon basin area was at category 3 under natural condition which is considered to be average or good, but at current condition, it belongs to category 5 which falls into very unfavorable condition. Evaluation approach and indicators proposed in this study are expected to make commitment to analyzing the instreamflow of urban river and water improvement policy.

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