환경인자를 이용한 산지계류의 계절별 수온변화 예측

To estimate headwater stream temperature with seasonal variations, we analyzed precipitation, runoff and air temperature in experimental forest of Kangwon National University, Gangwon-do (2017~2018 years). The daily mean value of headwater stream temperature for spring was 6.9~17.7℃ and correlated with air temperature, that for summer and fall were 12.2~26.3℃ and 3.6~19.3℃, correlated with air temperature and runoff. Based on seasonal variations, we applied for stepwise multiple linear regression analyses to estimate headwater stream temperature with seasonal variations. The equations were headwater stream temperature(WT)spring=(0.553×Air temperature)+(0.086×Runoff)+4.145 (R2=0.505; p<0.01), WTsummer =(0.756×Air temperature)+(-0.072×Runoff)+2.670 (R2=0.510; p<0.01), and WTfall=(0.738×Air temperature) +(0.028×Precipitation)+2.660 (R2=0.844; p<0.01). The coefficient of determination (R2) was greater than when it was estimated by air temperature in all seasons and progressively increased from spring to winter. Therefore, we indicated difference on estimated magnitude of stepwise multiple linear regression, due to effects on headwater stream temperature of different environmental factors with seasonal variations. Furthermore, temporal factors with spatial characteristics (e.g., river versus headwater stream) could be recommended for estimating headwater stream temperature.