Estimation of the Future River Flood and Inundation Risk Due to Climate Change

Yokoki, Hiromune; Tomura, Tatsuya; Hanawa, Naoyuki; Kuwahara, Yuji; Mimura, Naoya

doi:10.2208/proge.16.87

Cited by 2 publications

(1 citation statement)

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“…They can be used to determine the time delay it takes for precipitation in the catchment to take effect on the water level of water bodies [22]. In hydrology, this method has been successfully applied to rivers and groundwater [24][25][26], but not to lakes.…”

Section: Introductionmentioning

confidence: 99%

Estimation of the Average Retention Time of Precipitation at the Surface of a Catchment Area for Lake Biwa

Iwaki

Yamashiki

Toda

et al. 2021

Water

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In a lake catchment system, we analyzed the lake water-level responses to precipitation. Moreover, we identified the average precipitation retention time—due to subsurface flows—from the delay time calculated using the response function with data of water level and catchment precipitation (both rainfall and snowfall) collected over 30 years of continuous observations of Lake Biwa, Japan. We focused on the snow reserves and the water-level response delay due to the snowmelt of Lake Biwa catchment. We concluded that the average precipitation retention time of the catchment subsurface flow (i.e., above the impermeable layer) in Lake Biwa was approximately 45 days. Additionally, the precipitation retention time during snowmelt was shorter than that during the dry season. Overall, the shape of the response function reflects the lake system. This knowledge improves the understanding of lake systems and can be helpful for lake resource managers. Furthermore, finding the delay time from the response function may be useful for determining the contribution of rainfall to increasing the water levels of other lakes. Therefore, our results can contribute to the development of management strategies to address inland aquatic ecosystems and conservation.

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Section: Introductionmentioning

confidence: 99%

Estimation of the Average Retention Time of Precipitation at the Surface of a Catchment Area for Lake Biwa

Iwaki

Yamashiki

Toda

et al. 2021

Water

View full text Add to dashboard Cite

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An Estimation of Precipitation Retention Time Using Depth Metres in the Northern Basin of Lake Biwa

2022

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To facilitate climate change adaptations and water management, estimates of precipitation retention time (time required for precipitation to reach a lake) can help to accurately determine a water body’s terrestrial water storage capacity and water cycle. Although estimating the precipitation retention time on land is difficult, estimating the lag between precipitation on land and a rise in lake water levels is possible. In this study, the delay times (using a depth metre installed in the mooring system in the northern basin of Lake Biwa from August 2017 to October 2018) were calculated using response functions, and it evaluated the precipitation retention time in the catchment. However, as several delays between the river surface flow (<1 d) and shallow subsurface flow (≈45 d) remained unidentified, the delay times resulting from direct precipitation on the lake as well as from internal seiches were determined. The results suggest that delay times of approximately 20 d correspond to the paddy–waterway system between the river inflow and the subsurface flow, and that this effect corresponds to that of large rivers such as the Ane River. These findings can enhance water management strategies regarding the regulation of river flows, adapting to climate change-induced fluctuations in precipitation.

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Estimation of the Future River Flood and Inundation Risk Due to Climate Change

Cited by 2 publications

References 0 publications

Estimation of the Average Retention Time of Precipitation at the Surface of a Catchment Area for Lake Biwa

Estimation of the Average Retention Time of Precipitation at the Surface of a Catchment Area for Lake Biwa

An Estimation of Precipitation Retention Time Using Depth Metres in the Northern Basin of Lake Biwa

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