건천화된 농촌소하천의 시·공간적 수문 수질 특성분석

Abstract

The purpose of this study was to analyze the temporal and spatial characteristics of the stream flow of small rural streams forinvestigating the status of stream depletion located downstream of irrigation reservoir. Bonghyun and Hai reservoirs and eachdownstream were selected for this study. Streamflow was measured for 8 stations downstream from two reservoirs from 2010 to2012. The water quality samples were collected monthly from the 8 stream stations and 2 reservoir stations from 2011 to 2012. Thestream depletion was found in most of the downstream of reservoirs for the non-irrigation period and even in the irrigation periodwhen there were a lot of antecedent precipitation. We found that the stream segments where there were few streamflow, vegetationcovers the stream and block the streamflow which makes the stream lost its original function as a stream. Water quality monitoringresults of Bonghyun stream indicated that the concentration of SS, Turbidity, TOC, COD were decreased as the stream flows fromthe reservoir to downstream while the TN and TP were increased. The correlation analysis for water quality data indicated that thecorrelation between T-N and T-P was high for Bonghyeon and Sukji streams, respectively. Continuous monitoring for rural streamslocated in downstream of reservoirs are required to quantify the status of stream flow depletion and determine the amount ofenvironmental flows.