[논문]Optimal Rainfall Estimation by Considering Elevation in the Han River Basin, South Korea

Yoon, Seong-Sim; Bae, Deg-Hyo

doi:10.1175/JAMC-D-11-0147.1

Optimal Rainfall Estimation by Considering Elevation in the Han River Basin, South Korea 원문보기

Journal of applied meteorology and climatology, v.52 no.4, 2013년, pp.802 - 818

Yoon, Seong-Sim , Bae, Deg-Hyo

Abstract ▼ AI-Helper

AbstractMore than 70% of South Korea has mountainous terrain, which leads to significant spatiotemporal variability of rainfall. The country is exposed to the risk of flash floods owing to orographic rainfall. Rainfall observations are important in mountainous regions because flood control measures depend strongly on rainfall data. In particular, radar rainfall data are useful in these regions because of the limitations of rain gauges. However, radar rainfall data include errors despite the development of improved estimation techniques for their calculation. Further, the radar does not provide accurate data during heavy rainfall in mountainous areas. This study presents a radar rainfall adjustment method that considers the elevation in mountainous regions. Gauge rainfall and radar rainfall field data are modified by using standardized ordinary cokriging considering the elevation, and the conditional merging technique is used for combining the two types of data. For evaluating the proposed technique, the Han River basin was selected; a high correlation between rainfall and elevation can be seen in this basin. Further, the proposed technique was compared with the mean field bias and original conditional merging techniques. Comparison with kriged rainfall showed that the proposed method has a lesser tendency to oversmooth the rainfall distribution when compared with the other methods, and the optimal mean areal rainfall is very similar to the value obtained using gauges. It reveals that the proposed method can be applied to an area with significantly varying elevation, such as the Han River basin, to obtain radar rainfall data of high accuracy.

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Optimal Rainfall Estimation by Considering Elevation in the Han River Basin, South Korea 원문보기

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Optimal Rainfall Estimation by Considering Elevation in the Han River Basin, South Korea 원문보기

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