Impact of irrigation reservoirs on budget of the watershed-scale water cycle under climate change

Seokhyeon Kim, Soonho Hwang, Jung-Hun Song, Hyunji Lee and Moon-Seong Kang

Agricultural Water Management, 2023, vol. 283, issue C

Abstract: In this study, changes in the water cycle of watersheds due to climate change were analyzed by evaluating direct runoff-based water cycle, and the impact of agricultural reservoirs on water cycle improvement was assessed. The watershed model, Hydrological Simulation Program–Fortran, and the reservoir model, Module-based hydrologic Analysis System for Agricultural watersheds, were linked to analyze the hydrologic components of watersheds, including irrigation reservoirs. Calibration and validation were performed using the measurement data for upstream, downstream, and reservoir water levels, which estimated upstream calibration and validation to be R2 = 0.96, NSE = 0.94and R2 = 0.74, NSE = 0.74, respectively; downstream calibration and validation to be R2 = 0.72, NSE = 0.69 and R2 = 0.78, NSE = 0.71, respectively; and reservoir level to be R2 = 0.76. Water cycle evaluation based on direct runoff was performed using reservoir overflow, rice paddy drainage, and downstream direct runoff, and changes in direct runoff due to the supply of agricultural water through reservoirs were reflected. This study found that as climate change intensified, the water cycle underwent significant changes, including increases in evapotranspiration, rainfall, and runoff. Direct runoff although without a large difference in ratio, increased in quantity, leading to increased variation. Moreover, extreme rainfall events caused a decrease in effective rainfall, which could impact agricultural water supply. The effect of an agricultural reservoir was analyzed using a scenario without a reservoir. Agricultural reservoirs reduce runoff and increase evapotranspiration owing to reservoir retention and water supply. Furthermore, as agricultural water supplies increased, direct runoff decreased, thereby improving the water cycle. Retention reduced the water cycle variation with the same rainfall, contributing to watershed water cycle management and water supply planning. Overall, agricultural reservoirs effectively responded to changes in the watershed water cycle due to climate change.

Keywords: Agricultural water supply; Watershed-reservoir linkage model; Direct runoff; Retention (search for similar items in EconPapers)
Date: 2023
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Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:agiwat:v:283:y:2023:i:c:s0378377423001920

DOI: 10.1016/j.agwat.2023.108327

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