Development of Nomogram for Debris Flow Forecasting Based on Critical Accumulated Rainfall in South Korea
Climate change causes extreme weather events worldwide such as increasing temperatures and changing rainfall patterns. With South Korea facing growing damage from the increased frequency of localized heavy rains. In particular, its steep slope lands, including mountainous areas, are vulnerable to da...
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doaj-ebf66af5dcdb4d3cbea5cfdbe0bfab9e2020-11-24T21:19:01ZengMDPI AGWater2073-44412019-10-011110218110.3390/w11102181w11102181Development of Nomogram for Debris Flow Forecasting Based on Critical Accumulated Rainfall in South KoreaDong-Ho Nam0Suk-Ho Lee1Byung-Sik Kim2Department of Urban Environment & Disaster Management, School of Disaster Prevention, Kangwon National University, 346 Joongang-ro, Samcheok-si Gangwon-do 25913, KoreaDepartment of Urban Environment & Disaster Management, School of Disaster Prevention, Kangwon National University, 346 Joongang-ro, Samcheok-si Gangwon-do 25913, KoreaDepartment of Urban Environment & Disaster Management, School of Disaster Prevention, Kangwon National University, 346 Joongang-ro, Samcheok-si Gangwon-do 25913, KoreaClimate change causes extreme weather events worldwide such as increasing temperatures and changing rainfall patterns. With South Korea facing growing damage from the increased frequency of localized heavy rains. In particular, its steep slope lands, including mountainous areas, are vulnerable to damage from landslides and debris flows. In addition, localized short-term heavy rains that occur in urban areas with extremely high intensity tend to lead a sharp increase in damage from soil-related disasters and cause huge losses of life and property. Currently, South Korea forecasts landslides and debris flows using the standards for forecasting landslides and heavy rains. However, as the forecasting is conducted separately for rainfall intensity and accumulated rainfall, this lacks a technique that reflects both amount and intensity of rainfall in an episode of localized heavy rainfall. In this study, aims to develop such a technique by collecting past cases of debris flow occurrences and rainfall events that accompanied debris flows to calculate the rainfall triggering index (RTI) reflecting accumulated rainfall and rainfall intensity. In addition, the RTI is converted into the critical accumulated rainfall (<inline-formula> <math display="inline"> <semantics> <mrow> <msub> <mi>R</mi> <mi>c</mi> </msub> </mrow> </semantics> </math> </inline-formula>) to use rainfall information and provide real-time forecasting. The study classifies the standards for flow debris forecasting into three levels: ALERT (10−50%), WARNING (50−70%), and EMERGENCY (70% or higher), to provide a nomogram for 6 h, 12 h, and 24 h. As a result of applying this classification into the actual cases of Seoul, Chuncheon, and Cheongju, it is found that about 2−4 h of response time is secured from the point of the Emergency level to the occurrence of debris flows.https://www.mdpi.com/2073-4441/11/10/2181rainfall intensitydebris flow forecastingrainfall triggering index (rti)critical accumulated rainfall (<i>r<sub>c</sub></i>)nomogram |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Dong-Ho Nam Suk-Ho Lee Byung-Sik Kim |
spellingShingle |
Dong-Ho Nam Suk-Ho Lee Byung-Sik Kim Development of Nomogram for Debris Flow Forecasting Based on Critical Accumulated Rainfall in South Korea Water rainfall intensity debris flow forecasting rainfall triggering index (rti) critical accumulated rainfall (<i>r<sub>c</sub></i>) nomogram |
author_facet |
Dong-Ho Nam Suk-Ho Lee Byung-Sik Kim |
author_sort |
Dong-Ho Nam |
title |
Development of Nomogram for Debris Flow Forecasting Based on Critical Accumulated Rainfall in South Korea |
title_short |
Development of Nomogram for Debris Flow Forecasting Based on Critical Accumulated Rainfall in South Korea |
title_full |
Development of Nomogram for Debris Flow Forecasting Based on Critical Accumulated Rainfall in South Korea |
title_fullStr |
Development of Nomogram for Debris Flow Forecasting Based on Critical Accumulated Rainfall in South Korea |
title_full_unstemmed |
Development of Nomogram for Debris Flow Forecasting Based on Critical Accumulated Rainfall in South Korea |
title_sort |
development of nomogram for debris flow forecasting based on critical accumulated rainfall in south korea |
publisher |
MDPI AG |
series |
Water |
issn |
2073-4441 |
publishDate |
2019-10-01 |
description |
Climate change causes extreme weather events worldwide such as increasing temperatures and changing rainfall patterns. With South Korea facing growing damage from the increased frequency of localized heavy rains. In particular, its steep slope lands, including mountainous areas, are vulnerable to damage from landslides and debris flows. In addition, localized short-term heavy rains that occur in urban areas with extremely high intensity tend to lead a sharp increase in damage from soil-related disasters and cause huge losses of life and property. Currently, South Korea forecasts landslides and debris flows using the standards for forecasting landslides and heavy rains. However, as the forecasting is conducted separately for rainfall intensity and accumulated rainfall, this lacks a technique that reflects both amount and intensity of rainfall in an episode of localized heavy rainfall. In this study, aims to develop such a technique by collecting past cases of debris flow occurrences and rainfall events that accompanied debris flows to calculate the rainfall triggering index (RTI) reflecting accumulated rainfall and rainfall intensity. In addition, the RTI is converted into the critical accumulated rainfall (<inline-formula> <math display="inline"> <semantics> <mrow> <msub> <mi>R</mi> <mi>c</mi> </msub> </mrow> </semantics> </math> </inline-formula>) to use rainfall information and provide real-time forecasting. The study classifies the standards for flow debris forecasting into three levels: ALERT (10−50%), WARNING (50−70%), and EMERGENCY (70% or higher), to provide a nomogram for 6 h, 12 h, and 24 h. As a result of applying this classification into the actual cases of Seoul, Chuncheon, and Cheongju, it is found that about 2−4 h of response time is secured from the point of the Emergency level to the occurrence of debris flows. |
topic |
rainfall intensity debris flow forecasting rainfall triggering index (rti) critical accumulated rainfall (<i>r<sub>c</sub></i>) nomogram |
url |
https://www.mdpi.com/2073-4441/11/10/2181 |
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