scholarly journals Avaliação das Construções Danificadas por Corridas de Detritos e Inundações Bruscas no Vale do Ribeira (SP) em 2014

2018 ◽  
pp. 57-67
Author(s):  
Luzia De Jesus Matos ◽  
Claudio José Ferreira ◽  
Carlos Valdir de Meneses Bateira ◽  
Bianca Carvalho Vieira
Keyword(s):  
Debris Flow ◽  
Flash Flood ◽  
Google Earth ◽  
Mud Flow

O presente estudo quantifica o número de construções atingidas por eventos de escoamentos como as corridas de detritos (debris flow), de lama (mud flow) e as consequentes inundações rápidas (flash flood) ocorridas nos municípios de Itaoca e Apiaí, Vale do Ribeira, em janeiro de 2014. O percurso dos eventos de 2014 foi cartografado por meio da distribuição dos depósitos inconsolidados sobre as áreas construídas. Ferramentas como as imagens históricas do Google Earth (agosto de 2014), ortofotos, fotografias do mesmo ano e trabalhos de campo possibilitaram a visualização dos eventos e das construções conforme as seguintes etapas metodológicas: 1) Mapeamento das construções em anos anteriores aos eventos; 2) Mapeamento das corridas e inundações rápidas deflagradas em 2014; 3) Sistematização de dados e quantificação das construções atingidas. Ao todo, foram mapeadas 1.221 construções das quais 565 foram diretamente atingidas pelas corridas ou inundações rápidas. Resultados preliminares destacam que a densidade de construções na área de deflagração dos eventos aumenta a quantidade dos elementos atingidos; os impactos, entretanto, são condicionados pela variação dos tipos dos processos perigosos

scholarly journals Characteristics and Prevention of the Debris Flows following Wenchuan Earthquake in Jushui River Basin, An County, China

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Yonggang Ge ◽  
Jianqiang Zhang ◽  
Xiaojun Guo
Keyword(s):  
Debris Flow ◽  
Wenchuan Earthquake ◽  
River Basin ◽  
Debris Flows ◽  
Flash Flood ◽  
River Channel ◽  
Hazard Identification ◽  
Control Mode ◽  
Potential Hazard ◽  
Prevention Measures

After analysing the catastrophic debris flows on August 18, 2012, and on July 9, 2013, in Jushui River basin, An County, the Wenchuan Earthquake seriously striken areas, it was found that they were characterized by the clay soil content of 0.1~1.2%, the density of 1.68~2.03 t/m3, the discharges of 62.2 m3/s to 552.5 m3/s, and the sediment delivery modulus of 1.0~9.4 × 104 m3/km2. Due to intense rainstorm, many large debris flows produced hazard chain, involved in flash flood, debris flow, dammed lake, and outburst flood, and rose Jushui River channel about 1~4 m as well as amplified flood. The hazards and losses mainly originated from the burying and scouring of debris flows, flood inundating, and river channel rise. The prevention of debris flows is facing the intractable problems including potential hazard identification, overstandard debris flow control, control constructions destructing, and river channel rapid rise. Therefore, the prevention measures for the basin, including hazard identification and risk assessment, inhabitants relocating, monitoring and alarming network establishing, emergency plans founding, and river channel renovating, and the integrated control mode for watershed based on regulating the process of debris flow discharge, were recommended for mitigation.

An Evaluation of Flash Flood and Debris Flow Guidance in Gangwon Province in Korea

2016 ◽  
Vol 12 (4) ◽  
pp. 85-96
Author(s):  
Byung In Yu ◽  
◽  
Byung Sik Kim ◽  
Suck Ho Lee ◽  
◽  
...  
Keyword(s):  
Debris Flow ◽  
Flash Flood

scholarly journals Venezuelan debris flow and flash flood disaster of 1999 studied

Eos ◽  
2001 ◽  
Vol 82 (47) ◽  
pp. 572-572 ◽  
Author(s):  
M. C. Larsen ◽  
G. F. Wieczorek ◽  
L. S. Eaton ◽  
B. A. Morgan ◽  
H. Torres-Sierra
Keyword(s):  
Debris Flow ◽  
Flash Flood ◽  
Flood Disaster

scholarly journals An Alternative Algorithm for Simulating Flash Flood

2021 ◽  
Vol 930 (1) ◽  
pp. 012076
Author(s):  
M F Khaldirian ◽  
A P Rahardjo ◽  
D Luknanto ◽  
R D R Sondi
Keyword(s):  
Numerical Modeling ◽  
Debris Flow ◽  
Coordinate System ◽  
Flash Flood ◽  
Front Propagation ◽  
Bed Elevation ◽  
Forward Difference ◽  
Lagrangian Coordinate ◽  
The Galerkin Method ◽  
Sediment Mixture

Abstract Most of the approaches in numerical modeling techniques are based on the Eulerian coordinate system. This approach faces difficulty in simulating flash flood front propagation. This paper shows an alternative method that implements a numerical modeling technique based on the Lagrangian coordinate system to simulate the water of debris flow. As for the interaction with the riverbed, the simulation uses an Eulerian coordinate system. The method uses the conservative and momentum equations of water and sediment mixture in the Lagrangian form. Source terms represent deposition and erosion. The riverbed in the Eulerian coordinate system interacts with the flow of the mixture. At every step, the algorithm evaluates the relative position of moving nodes of the flow part to the fixed nodes of the riverbed. Computation of advancing velocity and depth uses the riverbed elevation, slope data, and the bed elevation change computation uses the erosion or deposition data of the flow on the moving nodes. Spatial discretization is implementing the Galerkin method. Furthermore, temporal discretization is implementing the forward difference scheme. Test runs show that the algorithm can simulate downward, upward, and reflected backward 1-D flow cases. Two-D model tests and comparisons with SIMLAR software show that the algorithm works in simulating debris flow.

scholarly journals Flash flood and debris flow in the Harihara River, Kyushu, Japan

2000 ◽  
Vol 22 ◽  
Author(s):  
N. Gurung ◽  
A. Rahman ◽  
Y. Iwao
Keyword(s):  
Debris Flow ◽  
Heavy Rainfall ◽  
Flash Flood ◽  
Soil Mass ◽  
Field Investigation ◽  
Great Loss ◽  
Electrical Survey ◽  
Main Factors ◽  
Hidden Fault

The flash flood and debris flow after a heavy rainfall wiped out a village of southern Japan on the tragic midnight of 10 July 1997, and a great loss of property and lives took place in this ill-fated incident. After the heavy rainfall, the debris flow induced by a sudden flash flood took 21 lives in Southern Kyushu. Detailed field investigation, in situ survey, electrical survey, and hydrogeological analyses were conducted to find out the triggering factors of the disaster. The main factors of this disaster were a hidden fault and the perched groundwater. Moving soil mass downhill into the agricultural pond had triggered the flash flood. The details of sequential disaster events as perceived from the observation and analyses are presented in this paper.

scholarly journals Recent Debris-Flow and Flash-Flood History of Northeastern Yellowstone National Park

1996 ◽  
Vol 20 ◽  
pp. 3-11
Author(s):  
Joshua Landis ◽  
Grant Meyer
Keyword(s):  
Debris Flow ◽  
Yellowstone National Park ◽  
Little Ice Age ◽  
National Park ◽  
Flash Flood ◽  
Global Climate ◽  
Ice Age ◽  
Drought Severity ◽  
History Of ◽  
Flow Activity

An understanding of the ecological health of stream systems and riparian areas in Yellowstone National Park (YNP) requires knowledge of their response to climatic and hydrological influences; intrinsic factors such as relief and geological materials are important influences as well (e.g., O'Hara and Meyer 1995). Recent studies of southwestern (Ely et al. 1993) and midwestern U.S. rivers (Knox 1993) have shown that relatively minor climatic changes in the late Holocene are associated with large fluctuations in flood magnitude and frequency. In small, steep drainage basins of northeastern YNP (Figure 1), Meyer et al. (1992, 1995) associated increased fire-related debris-flow activity with decadal to millennial-scale cycles of drought over the Holocene. Observations of modern events indicate that debris-flow and flash floods are also produced in the absence of fire in this rugged mountainous region, primarily by intense summer thunderstorm precipitation. Although a correlation between drought severity and fire magnitude in Yellowstone is clear (Balling et al. 1992a, 1992b), the relationship hypothesized by Meyer et al. (1992,1995) between warm, drought-prone climatic episodes and debris-flow activity in this region requires further investigation. Therefore, we use relatively high-resolution lichenometric and tree­ring dating methods to construct a 250-year history of major hydrologic events in small, steep tributary basins of Soda Butte Creek in northeastern Yellowstone. This period spans the transition from the generally cooler global climate of the Little Ice Age to the present (e.g., Grove 1988). Although the Little Ice Age was not uniformly cold in either a spatial or temporal sense (Jones and Bradley 1995), and YNP climate is not well known in the earlier part of this interval, trends toward increasing summer temperatures and decreasing winter precipitation in YNP over the last ~100 yr are consistent with this transition (Balling et al. 1992a).

scholarly journals ICT approaches to integrating institutional and non-institutional data services for better understanding of hydro-meteorological phenomena

2012 ◽  
Vol 12 (6) ◽  
pp. 1961-1968 ◽  
Author(s):  
T. Bedrina ◽  
A. Parodi ◽  
A. Quarati ◽  
A. Clematis
Keyword(s):  
Real Time ◽  
Information And Communication Technologies ◽  
Data Exchange ◽  
Flash Flood ◽  
Google Earth ◽  
Weather Data ◽  
Monitoring Networks ◽  
Location Aware ◽  
Significant Case ◽  
Set Up

Abstract. It is widely recognised that an effective exploitation of Information and Communication Technologies (ICT) is an enabling factor to achieve major advancements in Hydro-Meteorological Research (HMR). Recently, a lot of attention has been devoted to the use of ICT in HMR activities, e.g. in order to facilitate data exchange and integration, to improve computational capabilities and consequently model resolution and quality. Nowadays, ICT technologies have demonstrated that it is possible to extend monitoring networks by integrating sensors and other sources of data managed by volunteer's communities. These networks are constituted by peers that span a wide portion of the territory in many countries. The peers are "location aware" in the sense that they provide information strictly related with their geospatial location. The coverage of these networks, in general, is not uniform and the location of peers may follow random distribution. The ICT features used to set up the network are lightweight and user friendly, thus, permitting the peers to join the network without the necessity of specialised ICT knowledge. In this perspective it is of increasing interest for HMR activities to elaborate of Personal Weather Station (PWS) networks, capable to provide almost real-time, location aware, weather data. Moreover, different big players of the web arena are now providing world-wide backbones, suitable to present on detailed map location aware information, obtained by mashing up data from different sources. This is the case, for example, with Google Earth and Google Maps. This paper presents the design of a mashup application aimed at aggregating, refining and visualizing near real-time hydro-meteorological datasets. In particular, we focused on the integration of instant precipitation depths, registered either by widespread semi-professional weather stations and official ones. This sort of information has high importance and usefulness in decision support systems and Civil Protection applications. As a significant case study, we analysed the rainfall data observed during the severe flash-flood event of 4 November 2011 over Liguria region, Italy. The joint use of official observation network with PWS networks and meteorological radar allowed for the making of evident finger-like convection structure.

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