Hazard assessment of debris flows for Leung King Estateof Hong Kong by incorporating GIS with numericalsimulations

Chau, Kam Tim; Lo, K.H.

doi:10.5194/nhess-4-103-2004

Cited by 31 publications

(41 citation statements)

References 19 publications

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“…Some examples exist where numerical models can be coupled with proprietary GIS software, e.g. FLO-2D (O'Brien, 2003), SAMOS (Sampl and Zwinger, 2004) or an application of the Takahashi et al (1992) model (Chau and Lo, 2004). Some other models have been used in combination with GRASS GIS, like DAN (Hungr, 1995;Revellino et al, 2008) or TI-TAN2D (Pitman et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Physically-based modelling of granular flows with Open Source GIS

Mergili

Schratz

Ostermann

et al. 2012

Nat. Hazards Earth Syst. Sci.

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Abstract. Computer models, in combination with Geographic Information Sciences (GIS), play an important role in up-to-date studies of travel distance, impact area, velocity or energy of granular flows (e.g. snow or rock avalanches, flows of debris or mud). Simple empirical-statistical relationships or mass point models are frequently applied in GISbased modelling environments. However, they are only appropriate for rough overviews at the regional scale. In detail, granular flows are highly complex processes and physicallybased, distributed models are required for detailed studies of travel distance, velocity, and energy of such phenomena. One of the most advanced theories for understanding and modelling granular flows is the Savage-Hutter type model, a system of differential equations based on the conservation of mass and momentum. The equations have been solved for a number of idealized topographies, but only few attempts to find a solution for arbitrary topography or to integrate the model with GIS are known up to now. The work presented is understood as an initiative to integrate a fully physicallybased model for the motion of granular flows, based on the extended Savage-Hutter theory, with GRASS, an Open Source GIS software package. The potentials of the model are highlighted, employing the Val Pola Rock Avalanche (Northern Italy, 1987) as the test event, and the limitations as well as the most urging needs for further research are discussed.

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Section: Introductionmentioning

confidence: 99%

Physically-based modelling of granular flows with Open Source GIS

Mergili

Schratz

Ostermann

et al. 2012

Nat. Hazards Earth Syst. Sci.

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“…The majority of authors study debris flow hazard on a regional scale with the geographic information system (GIS), in combination with statistical analysis, simple dynamic methods and interpretation of satellite images or aerial photographs (Mark, Ellen, 1995;Iverson et al, 1998;Guzzetti et al, 1999;Hofmeister et al, 2002;Lin et al, 2002;Huggel et al, 2003;Liu, Lei, 2003;Vallance et al, 2003;Pallas et al, 2004). On a local scale, comprehensive field work is necessary to determine the hazard in the debris flows' deposition areas (García et al, 2003;Chau, Lo, 2004;Pasuto, Soldati, 2004).…”

Section: Debris Flow Hazards and Their Relation To Clime Changes And mentioning

confidence: 99%

Impact of Water-Induced Processes on the Development of Tarns and Their Basins in the High Tatras

Tomko-Králo

Hreško

Jakab

2017

Ekológia (Bratislava)

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Tomko-Králo D., Hreško J., Jakab I.: Impact of water-induced processes on development of the tarns and their basins in the High Tatras. Ekológia (Bratislava), Vol. 36, No. 3, p. 247-267, 2017. In the report we concentrate on the influences of water-induced morphodynamic processes and surface flow on the development of tarns in alpine environment conditions of selected valleys in the High Tatras. Model areas are represented by higher basins parts in the Malá Studená valley and the Veľká Studená valley, where we confirmed that slope-gravitational processes in the form of rockfall, water-gravitational processes in the form of debris flows, but also fluvial-proluvial processes as the accumulation of the soft fractions from the area of debris cones take part in the material deposition in the tarns. In this context we focused on the creation of the model of spatial distribution of the water-induced potential of material deposition in drainage tarn basins. The model includes three basic factors: slope and curvature of the relief and land cover character. Map processing with GIS technologies was done on the basis of a 3-D relief model, which allowed the locating of the local erosion bases areas, where the material could be accumulated. The achieved results confirmed the hypothesis that tarn basin development of the alpine environment is subordinated to permanent backfilling as a consequence of the cumulative influence of the several processes connected with rainfall and the runoff regime of the drainage basins.

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“…(a) Heuristically potential sources can be identified as in Benda and Cundy (1990) or Chau and Lo (2004) in the field and on aerial photographs. Statistical…”

Section: Introductionmentioning

confidence: 99%

“…So far, only a few physically-based runout models have been applied on a medium-scale due to calibration difficulties. Chau and Lo (2004) adjusted a physically-based runout model to one recorded event including friction and erosion and computed the potential runout of several unstable areas on the basis of this adjustment. While deterministic approaches are very well transferable to basically any site since they consider the physical characteristics of the process, they are characterised by rather high data requirements for the calibration.…”

Section: Introductionmentioning

confidence: 99%

Assessment of debris-flow susceptibility at medium-scale in the Barcelonnette Basin, France

Kappes

Malet

Remaître³

et al. 2011

Nat. Hazards Earth Syst. Sci.

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Abstract. Debris flows are among the most dangerous processes in mountainous areas due to their rapid rate of movement and long runout zone. Sudden and rather unexpected impacts produce not only damages to buildings and infrastructure but also threaten human lives. Medium-to regional-scale susceptibility analyses allow the identification of the most endangered areas and suggest where further detailed studies have to be carried out. Since data availability for larger regions is mostly the key limiting factor, empirical models with low data requirements are suitable for first overviews. In this study a susceptibility analysis was carried out for the Barcelonnette Basin, situated in the southern French Alps. By means of a methodology based on empirical rules for source identification and the empirical angle of reach concept for the 2-D runout computation, a worst-case scenario was first modelled. In a second step, scenarios for high, medium and low frequency events were developed. A comparison with the footprints of a few mapped events indicates reasonable results but suggests a high dependency on the quality of the digital elevation model. This fact emphasises the need for a careful interpretation of the results while remaining conscious of the inherent assumptions of the model used and quality of the input data.

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Hazard assessment of debris flows for Leung King Estateof Hong Kong by incorporating GIS with numericalsimulations

Cited by 31 publications

References 19 publications

Physically-based modelling of granular flows with Open Source GIS

Physically-based modelling of granular flows with Open Source GIS

Impact of Water-Induced Processes on the Development of Tarns and Their Basins in the High Tatras

Assessment of debris-flow susceptibility at medium-scale in the Barcelonnette Basin, France

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