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Development of Method of Discharge Estimate at Ungauged Watershed by Drainage Area Ratio Method Considering Watershed Characteristics

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In estimating the discharge of the ungauged watershed, we tried to estimate the discharge by applying the weight of the watershed characteristics without using a numerical model. To calculate the discharge of the ungauged watershed considering the watershed characteristics, applied the weight of the watershed characteristics to the existing drainage area ratio method. The watershed development degree and hydraulic structures in the watershed for watershed characteristics were applied as weights. As a result of scenario A, it was analyzed that 2 out of 6 observation stations were underestimated, two were overestimated. As a result of scenarios B, C, and D, the ratio of the calculated discharge to the observed discharge was analyzed to be relatively closer to 1.0 than that of scenario A but still analyzed that the error was significant. In the future, to more accurately calculate the discharge in the ungauged watershed considering the characteristics of the watershed, it will be necessary to develop a quantitative evaluation method.
Title: Development of Method of Discharge Estimate at Ungauged Watershed by Drainage Area Ratio Method Considering Watershed Characteristics
Description:
In estimating the discharge of the ungauged watershed, we tried to estimate the discharge by applying the weight of the watershed characteristics without using a numerical model.
To calculate the discharge of the ungauged watershed considering the watershed characteristics, applied the weight of the watershed characteristics to the existing drainage area ratio method.
The watershed development degree and hydraulic structures in the watershed for watershed characteristics were applied as weights.
As a result of scenario A, it was analyzed that 2 out of 6 observation stations were underestimated, two were overestimated.
As a result of scenarios B, C, and D, the ratio of the calculated discharge to the observed discharge was analyzed to be relatively closer to 1.
0 than that of scenario A but still analyzed that the error was significant.
In the future, to more accurately calculate the discharge in the ungauged watershed considering the characteristics of the watershed, it will be necessary to develop a quantitative evaluation method.

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