A study on the Development of River Turbidity by the Rainfall Properties in the Watershed of Highland-agriculture

고랭지유역의 강우특성에 의한 하천탁도 발생에 관한 연구

This study inquired into changes of turbidity of a river depending on the rainfall characteristics of each month through investigating the water quantity and turbidity of Jawoonchun drainage basin in the upper reaches of Soyangho (lake) for the year of 2005. It could be seen from the study that high turbidity occurred during the period from May to August due to rainfall intensity and rainfall duration. On the other hand, it could be confirmed that turbidity was constantly low after September because of early cleansing effect of rainfall. Next, the influence of controlling factors of turbidity was looked into. For May and June, it was 89% rainfall intensity among the controlling factors, for July and August, it was 67% rainfall intensity and 32% rainfall duration that was confirmed to have influence over the occurrence of turbidity. In addition, regression analysis was carried out about the controlling factors that had influence over the occurrence of turbidity and regression equation was suggested.

본 연구는 소양호 상류유역의 자운천 유역을 대상으로 2005년 1개년동안 유량과 탁도를 조사하여, 월별로 강우특성에 따른 하천의 탁도가 변화하는 양상을 고찰하였다. 고찰결과, 5월$\sim$8월에 강우강도 및 강우지속시간에 의하여 높은 탁도가 발생되는 것을 알 수 있었으며, 반면 9월 이후에는 강우의 초기 세척효과로 인하여 탁도가 낮게 지속적으로 발생되는 것을 확인하였다. 다음으로 탁도에 대한 지배인자의 영향력을 살펴보았으며, 5월, 6월에는 지배인자중 강우강도가 89%, 7월, 8월에는 강우강도가 67%, 강우지속시간이 32%로 탁도 발생에 유의적인 영향을 미치고 있는 것을 확인하였다. 또한 탁도 발생에 영향력 있는 지배인자에 대하여 회귀분석을 실시하여 회귀식을 제안하였다.