2023-01-012024-05-15https://scholars.lib.ntu.edu.tw/handle/123456789/666379水流路徑在流域尺度下調控水量和水質的永續性，對於以溪水作為主體的濁水溪流域至為關鍵。透過裡使數據分析，我們之前研究發現，濁水溪的溪水年齡約為 1.7 年。 然而，溪水年齡的季節性變化仍然還待更多調查，而得以作為區域水資源管理之基礎。在估計溪水年齡動態時，最大的困難在於大部分的水文過程發生在地下，同時即使是高頻率的監測效果也有限。然而，隨著同位素水文學的發展，示踪劑輔助建模已經被提出與發展，溪流和流動地下水的年齡可以通過這些搭配降/水溪流的通量和示踪劑觀測的模型來提高可信度。因此，本計畫將使用雙重方法來估算濁水溪的溪水年齡動態：首先，我們將繼續每兩周和颱風期間對降水和流量進行採樣，並測定樣品的水同位素；接著，將使用三階儲庫選擇模型 (SAS-3) 來了解溪水年齡的季節性變化；最後，我們將結合水流與土壤的土水模式 (SWAT) ，建立一個方案來幫助確定溪水年齡動態。這個新方案可以增進 SWAT 對水分運輸過程的解釋效果，並幫助建立適合台灣的水同位素河水動態模式。 Streamwater trajectories regulate the water quantity and quality sustainability at the watershed scale, which is critical to the Zhuoshui River, where the main water source is streamwater. Our prior work based on the historical data showed median streamflow age of Zhoushui is approx. 1.7 yr. However, the seasonal variation of streamflow age is still a mist, which plays a fundamental role in regional water resource management. Significant difficulties in estimating streamflow age dynamics lie in that hydrological processes occur underground, and high temporal frequency observations are limited. However, with the progress of isotope hydrology, tracer-aided modeling has been proposed and developed. Thus, the water age of streamflow and mobile groundwater can be determined by these models coupling flux and tracer observations of precipitation and streamflow. This project will use dual approaches to estimate streamflow age dynamics in the Zhuoshui River. Firstly, we will continue to sample precipitation and streamflow biweekly and during typhoon events, and the water isotope of samples will be determined. Then, the three-layer StorAge Selection (SAS-3) model will be used to understand the seasonal variation of streamflow ages. Secondly, we will develop a scheme to determine water ages based on the Soil and Water Assessment Tool (SWAT). This new scheme could improve the SWAT`s interpretation of the transport process. Approval of this project will set the synthesized water-isoscape study in Taiwan.水流路徑;停留時間;儲庫年紀選擇法;土水模式;Flowpath;Transit time;StorAge Selection (SAS);SWAT