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Proposal of Early-Warning Criteria for Highway Debris Flow Using Rainfall Frequency (1): Proposal of Rainfall Criteria

확률 강우량을 이용한 고속도로 토석류 조기경보기준 제안 (1) : 강우기준 제안

  • Choi, Jaesoon (Department of Civil and Architectural Engineering, Seokyeong University)
  • 최재순 (서경대학교 토목건축공학과)
  • Received : 2019.05.23
  • Accepted : 2019.06.21
  • Published : 2019.06.30

Abstract

In this study, we propose rainfall frequency criteria for the development of early-warning system based on the evaluation of the highway debris flow that includes the contents of the rainfall recurrence cycle. The rainfall criterion was recommended based on the results of previous researches and the recommended rainfall criterion was 1 hour, 6 hours, and 3 days. At this time, the study subjects were located in Gangwon area and the probability rainfall of 8 stations in Gangwon area was collected. Also, the probabilistic distribution of the 1 hour, 6 hour, and 3 day rainfall criteria to be used for the early warning for the highway debris flow in Kangwon area was estimated through the probability analysis. In addition, we analyzed the correlation between 3 types of rainfall criteria selected from the rainfall data and the actual destructive damages of debris flow at 12 points in 7 lines of Gangwon highways. At this time, the rainfall criterion on the probability distribution was divided into an average value and a lower limit value. As a result of the review, it was found that the case of using the lower limit value of the rainfall according to the recurrence intervalwell simulates the situation of actual debris flow hazards.

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Fig. 1. Severity Rating according to disaster score and fragile score (Kim, 2009)

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Fig. 2. Time continuous rainfall and rainfall (Yune et al., 2010)

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Fig. 3. Damage shipments of domestic landslide(http://sansatai.forest.go.kr)

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Fig. 4. Landslide prediction criteria of the Forest Service (http://sansatai.forest.go.kr)

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Fig. 5. Korea precipitation frequency data server (www.k-id.re.kr)

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Fig. 6. Location of main area

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Fig. 7. Normal distribution table according to rainfall frequncy

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Fig. 8. Monthly rainfall before debris flow occurred

Table 1. Comparison of debris-flow decision table

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Table 2. Severity level of risk (Kim, 2009)

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Table 3. Landslide early warning criteria the Forest Service

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Table 4. Latitude and longitude of main area

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Table 5. 1 hour rainfall Status

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Table 6. 6 hours rainfall Status

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Table 7. 3 days rainfall Status

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Table 8. Average and standard deviation of probable rainfall

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Table 9. Debris-flow hazard example at highway in Gangwon area

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Table 10. Rainfall criterion for early warning of highway debris flow

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Table 11. Assessment of rainfall criterion by comparison with rainfall data at debris flow occurrence

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Acknowledgement

Supported by : 행정안전부

References

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