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DOI: https://doi.org/10.4491/eer.2018.105
A study on water quality change by land use change using HSPF
Tae Geun Kim1, and Kyoung-sik Choi2
1Department of Environmental Engineering, Cheongju University, Chungbuk 28503, Republic of Korea
2Department of Energy Chemical Engineering, Silla University, Busan 46958, Republic of Korea
Corresponding Author: Kyoung-sik Choi ,Tel: +82-51-999-5256, Fax: +82-51-999-5173, Email: kschoi@silla.ac.kr
Received: March 20, 2018;  Accepted: March 19, 2019.
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Non-point source pollutant load reductions were calculated using the Hydrologic Simulation Program-Fortran (HSPF) model under the assumption that landuse pattern was changed according to land purchases. Upon the simulation of non-point pollutant and areas with high land purchase ratios to select a buffer zone, the Namgang dam Reach 11, Imha dam Reach 10, and the Reach 136 watershed of the main river were found to rank high for the construction of buffer zones. Assuming that the forms of the purchased lands were changed to wetlands, biological oxygen demand (BOD) loads were changed through the HSPF model. No changes of BOD were present in the Namgang dam and the Imha dam watersheds. BOD loads in Reach 136 according to landuse change were analyzed through a flow duration analysis based on the total maximum daily loads of the United States. The flow duration analyses undertaken to examine changes in BOD of main river Reach 136 watershed indicated a shift of 0.64 kg/d from 3.16 to 2.52 during high flow. The change of BOD under the conditions of moist, mid-range and dry were 11.9%, 9% and 4.5%. At the low flow condition, the variation range in the BOD load was from 0.58 kg/d to 0.41 kg/d.
Keywords: BOD | Buffer-strip | Flow duration | HSPF | Land purchasing
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