Engineer-Journal of the Institution of Engineers Sri Lanka最新文献

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A Critical Evaluation of Streamflow Estimation of an Ungauged Watershed using a Gauged Watershed of Same River Basin – Case of Nilwala River Basin 用同一流域的计量流域对未计量流域的流量估算的关键性评价——以尼尔瓦拉河流域为例

Q4 ENGINEERING, MULTIDISCIPLINARY

Engineer-Journal of the Institution of Engineers Sri Lanka

Pub Date : 2023-09-25 DOI: 10.4038/engineer.v56i3.7605

M. Wickramarachchi, N. T. S. Wijesekera

Transferring hydrological model parameters of a nearby gauged watershed to an ungauged watershed is being widely practiced to predict streamflow in the ungauged watershed. However, proper conclusions on transferring data from the main to sub-watershed and vice versa need to be established, then only watershed managers can plan where to locate or ensure optimum use of resources when establishing gauging stations. Therefore, the present study aimed to evaluate the performance of spatial transferability by using the Tank Model, which was initially calibrated to daily streamflow from water year 2008/09 to 2017/18 observed at two gauged watersheds in Nilwala River Basin, and then transferred from main to sub-watershed and vice versa. The efficiency of predictions under two parameter transferability scenarios was highly acceptable where the Mean Ratio of Absolute Error (MRAE) values were 0.35-0.39 and, the accuracy of annual water balance was 91.8%-93.3%. Most importantly, the best results were in the intermediate flow regime with an accuracy of 61%-70%. The monthly-scaled streamflow indicated an accuracy of 83%-92%. The present study demonstrated the liability of the Tank Model for successful estimation of daily streamflow with an average accuracy of 63% under spatial parameter transferability thereby with only a single wellmanaged streamflow gauging station, Tank Model can be applied for sustainable water resources management in similar ungauged watersheds of the basin.

将附近测量流域的水文模型参数转移到未测量流域，以预测未测量流域的流量，这是一种广泛的实践。但是，在数据从主流域向小流域传输和从小流域向主流域传输的过程中，需要建立正确的结论，只有流域管理者才能在建立测量站时规划选址或确保资源的最佳利用。因此，本研究旨在利用水槽模型对尼尔瓦拉河流域2008/09年至2017/18年的日流量进行空间可转移性评价，然后将其从主流域转移到小流域，从小流域转移到主流域。平均绝对误差比(MRAE)为0.35 ~ 0.39，年水量平衡的预测精度为91.8% ~ 93.3%，两种参数可转移情景下的预测效率均可接受。最重要的是，最佳结果是在中间流态，精度为61%-70%。月尺度的流量精度为83%-92%。本研究表明，在空间参数可转移性条件下，水箱模型能够成功估算日流量，平均精度为63%，因此，在只有一个管理良好的流量测量站的情况下，水箱模型可以应用于流域类似的未计量流域的可持续水资源管理。

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