평지 전작 유출수의 수문ㆍ수질 특성 모니터링

Abstract

Converting the agricultural land-use of rice field to upland has been increasingly conducted as farmers encourages themselves to grow highervalue-added crops on rice fields under the policy support. Comparing to rice field, Upland shows different characteristic of discharge due to the slope,scale, and shape of field and characteristics of rainfall event. In this study, we designed the experiment fields reflecting flat-upland characteristics withdifferent land scale, and tried to collect the discharge and load data. Soybeans and corn were selected as target crops considering the possibility oflarge-scale cultivation and crop demand. The cultivation was conducted during the growth period in 2019 with 3 different field scales. Hence, we havecollected the discharge data from 17 rainfall events and the load data for 8 rainfall events. As a result, the magnitude of rainfall events and the dischargeduration were found to have a strong positive correlation and field discharge occurred during the period by 55% to 83% of rainfall duration. Besideswe found other relationships and characteristics of rainfall event, discharge, and pollutant load and also pointed out that continuous monitoring and moredata are required to derive statistically significant results. Compared with slope-field monitoring data obtained from the precedent research, the runoffratio of the flat-fields was significantly lower than slope-fields. Overall the discharge in the slop and flat-fields shows appreciably different characteristicsso that the related researches need to be further conducted to reasonably assess environmental impact of agricultural activities at flat-field.