낙동강 유역의 잠재증발산량과 강우량의 시공간적 분포특성 분석

Abstract

The purpose of this study was to understand the water resource conditions in the Nakdong River basin through a spatio-temporal analysis of rainfalland potential evapotranspiration. The Penman-Monteith method was used to estimate potential evapotranspiration, and the difference between rainfall andpotential evapotranspiration (P-PET) was calculated. To compare and analyze the spatial distribution, meteorological data-such as maximum temperature,minimum temperature, wind speed, humidity, and sunshine duration-from 21 weather observation stations (ASOS) in the Nakdong River basin wereused, covering the period from 2011 to 2023. This period was standardized to the shortest observation timeframe for comparison purposes. This analysisrevealed that the potential evapotranspiration across 21 stations ranged from 885 mm to 1,112 mm, with an average of 936 mm. The P-PET resultsshowed that the southern region, particularly Busan, had abundant water resources, while northern areas like Bonghwa and Andong experienced waterdeficits. For analyzing the temporal distribution, 13 stations out of the 21, which had longer data periods, were selected, and data from 1973 to 2023were used. The Mann-Kendall analysis indicated increasing trends in potential evapotranspiration at five stations.