Abstract

본 연구에서는 안양천 유역에 대해 HSPF 모형을 구축하고 중유역과 전체유역의 물순환 현황 및 BOD 부하량을 정량적으로 파악하였다. 모형을 구축하기 위해 HSPF모형의 수량 및 BOD 농도에 대한 민감도 분석을 수행하여 매개변수를 선택하였다. 또한 다양한 특성을 갖고 있는 안양천 유역을 토지이용, 경사도 및 사용한 기상자료 등에 따라 4개 지역으로 구분하여 검 보정을 실시하여 정확도를 향상시켰다. 물순환 모의 결과 하류로 갈수록 도시화 비율이 높으며 이로 인해 기저유출량은 11.1 % <TEX>$\rightarrow$</TEX> 5.0 %로 줄어들고 직접유출량은 42.5 % <TEX>$\rightarrow$</TEX> 56.9 %로, BOD 농도는 3.3 mg/L <TEX>$\rightarrow$</TEX> 15.0 mg/L로, 단위면적당 원단위는 55.4 kg/ha/year <TEX>$\rightarrow$</TEX> 354.5 kg/ha/year로 늘어났다. The hydrologic cycle and BOD pollutant loads of all sub-watersheds were analyzed using HSPF (Hydrological Simulation Program-Fortran). At first, sensitivity analyses to water quantity (peak discharge and total volume) and quality (BOD peak concentrations and total loads) were conducted and some critical Parameters were selected. For more precise simulation, the study watershed was divided into four parts according to the landuse characteristics and used climate data and so calibrated and verified respectively. It was found that as the urban area ratio increases in the downstream direction, baseflow decreases (11.1 % <TEX>$\rightarrow$</TEX> 5.0%) and the ratio of direct runoff volume(42.5 % <TEX>$\rightarrow$</TEX> 56.9 %), BOD concentration (3.3 mg/L <TEX>$\rightarrow$</TEX> 15.0 mg/L) and unit loads (55.4 kg/ha/year <TEX>$\rightarrow$</TEX> 354.5 kg/ha/year) increase.

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