https://scholars.lib.ntu.edu.tw/handle/123456789/636637
標題: | Differences between Catchment Water Storage and Soil Water Storage in a Forested Headwater Catchment | 作者: | Chou, Li Han TARO NAKAI WEI-LI LIANG |
關鍵字: | contributing area | field monitoring | soil water content | water balance method | water conservation | 公開日期: | 1-一月-2023 | 卷: | 38 | 期: | 2 | 來源出版物: | Taiwan Journal of Forest Science | 摘要: | Studies on water storage in forested catchments in Taiwan have primarily been aimed at long-term and large-scale water storage estimations or economic assessments. However, there are few studies on water conservation mechanisms or comparisons of evaluation methods. In particular, investigation cases in head catchments where surface runoff originates are limited. This study used the water balance method to estimate the catchment water storage, and used the monitored data of 5–55 cm soil moisture to estimate shallow soil water storage in a headwater catchment. Relationships between catchment water storage and soil water storage were analyzed. Results showed that the amount of catchment water storage continued to decrease during the study period while the amount of soil water storage continued to increase or plateau. Amounts of catchment water storage and soil water storage were negatively correlated. However, daily changes in catchment and soil water storage values were positively correlated. Daily changes in soil water storage were approximately 11% of the daily changes in catchment water storage. These different trends in amounts and daily changes between catchment water storage and soil water storage were attributed to the runoff contributing area, hyporheic flow, and the calculation procedure of the water balance method. When using the catchment surface area as the runoff contributing area, the runoff was overestimated, and the amount of catchment water storage was underestimated. In addition, underestimation of catchment water storage was cumulative when using the long-term hydrological balance method. This resulted in a misinterpretation that the amount of catchment water storage continued to decrease. For a headwater catchment featuring variable sources of runoff, daily changes in catchment water storage could be appropriately evaluated by the short-term hydrological balance method. Daily changes in soil water storage could be used as an indicator for assessing daily changes in catchment water storage. Hydrological monitoring at different spatial scales would be helpful in clarifying the water conservation function of a forested headwater catchment. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/636637 | ISSN: | 10264469 |
顯示於: | 森林環境暨資源學系 |
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