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Application of Technique for Evaluating Streamflow Depletion in the Urbanized Small and Midium Watershed: Gyeongancheon, Wangsukcheon

  • Crisisonomy
  • Abbr : KRCEM
  • 2012, 8(6), pp.67-81
  • 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

Runoff characteristics of the urbanized watershed was affected by some urbanized factors including the increasement of unpermeable area, groundwater use, and the deceasement of groundwater level, so as the results, the stream depletion was increasing. In this study the stream depletion assessment method, which is to evaluate the depletion of the urbanized small & midium watershed stream, was suggested. To apply the streamflow depletion evaluation approach proposed in this study, Gyeongancheon and Wangsukchon were designated for investigation and using SWMM_GE program, long-term runoff characteristic was evaluated, and depth of streamflow depletion was evaluated using standard flow and evaluation indicators. In most of cases, the higher the impervious area ratio the more the flow during wet season and the less the flow during dry season. When it comes to the change by groundwater use, the flow tended to decrease regularly both during wet season and dry season. When it comes to the direct cause of streamflow depletion such as stream water intake, reservoir operation and sewage treatment plant, variation of flow and effect on depletion may be significantly different by scale of each factor. Based on flow characteristics in the region, standard flow was estimated and the depth of streamflow depletion was evaluated using evaluation indicators. As a result of evaluating of the depth at natural condition, category was distributed from 1 to 5 and mostly within 3 which resulted from changes to natural environment and the degree of streamflow depletion would not be significant if no artificial environment change occurred. The depth was various from category 1 to 5 indicating very low condition when considering impervious area ratio and groundwater use. However when considering the direct causes, the effect was various depending on location and scale of reservoir and sewage treatment plant.

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