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A Monitoring of Water Quantity and Quality from a Mixed Forest in Korea

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2007 ASAE Annual Meeting  072223.(doi:10.13031/2013.22993)
Authors:   Joong Dae Choi, Kyoung Jae Lim, Min Hwan Shin, Woong Gi Kim
Keywords:   NPS, forest, monitoring, watershed, water quality

A well flourished and conserved forest in Korea was monitored from August, 2004 to April, 2006 for 20 months with respect to flow and selected NPS pollution. Automatic water gauges were installed and measured water level continuously. Water samples were taken manually once every two weeks during dry days and 3 or more times a day during rainfall events and analyzed with respect to SS, BOD, T-N, NO3-N and T-P. Stream flow was well responded to the amount and intensity of rainfall events. The stream flow mostly provided through interflow or subsurface flow during rainfall events because sandy soil covered most of the watershed. Minimal surface flow was only observed during the monitoring period. Daily rainfall was grouped into 10 mm and 20 mm class and selected NPS concentrations were analyzed with respect to the daily rainfall class. NPS concentration did not increase with the increase of runoff during rainfall events. Even if concentration increased, it was not prominent to affect pollution load. It was thought that runoff increase was mostly caused by interflow and subsurface flow that could not transport NPS pollutants on the soil surface. NPS pollution loads from the forest watershed were generally higher than those from paddy fields. Selected NPS pollution loads per unit area at site S were SS 734 kg/ha/yr, BOD 390.4 kg/ha/yr, T-N 330.2 kg/ha/yr, NO3-N 105.2 kg/ha/yr, and T-P 11.29 kg/ha/yr. At site S2, the pollution loads were SS 614. kg/ha/yr, BOD 391.3 kg/ha/yr, T-N 287.2 kg/ha/yr, NO3-N 35.6 kg/ha/yr, and T-P 7.01 kg/ha/yr. The result results are being referred to adjust forest management policy and the development of TMDL plan in Korea.

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