Landslide hazard assessment in the Three Gorges area of the Yangtze River using ASTER imagery

Liu, J.P.; Mason, Philipa; Clerici, Nicola; Chen, S.; Davis, Angela; Fang, Miao; Deng, Hai Yan; Li, Liang

doi:10.1109/igarss.2003.1294090

Cited by 21 publications

(15 citation statements)

References 3 publications

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“…Some authors claim that overall water quality was not degraded in certain reservoirs, partly due to the low retention time of water (Cai & Hu, 2006). On the other hand, other studies found that the nutrient loads have been modified in the reservoir (Liu et al, 2004) and in the downstream river (Gong et al, 2006) due to enhanced soils/sediment releases. The trophic upsurge, associated with a global degradation of the physico-chemical water quality, is rapid due to the fast decomposition of the labile organic matter and the mobilization of compounds from the soils.…”

Section: Introductionmentioning

confidence: 96%

Evolution of the physico-chemical water quality in the Nam Theun 2 Reservoir and downstream rivers for the first 5 years after impoundment

et al. 2015

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-The physical (temperature, conductivity and turbidity) and chemical water quality (O 2 , pH, conductivity, nutrients, major anions and cations) characteristics have been monitored in the Nam Theun 2 system (hydroelectric reservoir and rivers downstream) for the first 5 years after impoundment. The results emphasize that the impoundment of the reservoir induced a substantial modification of the water quality in the whole aquatic system which is partially controlled by the hydrodynamics in the reservoir. During the warm seasons, the reservoir water column is thermally stratified with a warm oxic epilimnion and a colder anoxic hypolimnion. During the cold dry season or during floods, the reservoir water column over-turns which enhances oxygen penetration down to the bottom waters and contributes to a global improvement of the water quality. Downstream of the reservoir, the oxygen level was always above the minimum requirement for aquatic life due to the specific design of the water intakes at the Nakai Dam and upstream of the Power House which both favour the withdrawal of a large proportion of oxygenated epilimnic waters. Over the five years, the water quality in the reservoir itself globally improved. However, the diversion of the Nam Theun River into the Xe Bang Fai watershed via the reservoir has impacted the Xe Bang Fai River in terms of temperature, conductivity and total suspended solids.

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Section: Introductionmentioning

confidence: 96%

Evolution of the physico-chemical water quality in the Nam Theun 2 Reservoir and downstream rivers for the first 5 years after impoundment

et al. 2015

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“…In order to monitor slope surface movements in the Badong area, many investigators have used different instruments and methods. For examples, landslide hazard assessments have been carried out in the Three Gorges area of Yangtze River using ASTER imagery [18], using D-InSAR with corner reflectors [19], and also using PS-InSAR technique [12,20].…”

Section: Study Areamentioning

confidence: 99%

Characterization of Landslide Deformations in Three Gorges Area Using Multiple InSAR Data Stacks

et al. 2013

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“…They are able to cover large areas without ground access needed, data are comparably cheap and well accessible, and for some sensors a repeat cycle of a few days is possible (Gao and Liu, 2001;Huggel, 2004;Kääb, 2004 mapping and monitoring ground cover and its changes. It is often used for detecting hazard source areas and terrain changes, and for mapping of endangered zones (Buchroithner et al, 1982;Kääb et al, , 2003cHuggel et al, 2002Huggel et al, , 2004cLiu et al, 2005;Silverio and Jaquet, 2005). …”

Section: Airborne Remote Sensingmentioning

confidence: 99%

Remote sensing of glacier- and permafrost-related hazards in high mountains: an overview

Kääb

Huggel

Fischer

et al. 2005

Nat. Hazards Earth Syst. Sci.

250

149

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Abstract. Process interactions and chain reactions, the present shift of cryospheric hazard zones due to atmospheric warming, and the potential far reach of glacier disasters make it necessary to apply modern remote sensing techniques for the assessment of glacier and permafrost hazards in highmountains. Typically, related hazard source areas are situated in remote regions, often difficult to access for physical and/or political reasons. In this contribution we provide an overview of air-and spaceborne remote sensing methods suitable for glacier and permafrost hazard assessment and disaster management. A number of image classification and change detection techniques support high-mountain hazard studies. Digital terrain models (DTMs), derived from optical stereo data, synthetic aperture radar or laserscanning, represent one of the most important data sets for investigating high-mountain processes. Fusion of satellite stereo-derived DTMs with the DTM from the Shuttle Radar Topography Mission (SRTM) is a promising way to combine the advantages of both technologies. Large changes in terrain volume such as from avalanche deposits can indeed be measured even by repeat satellite DTMs. Multitemporal data can be used to derive surface displacements on glaciers, permafrost and landslides. Combining DTMs, results from spectral image classification, and multitemporal data from change detection and displacement measurements significantly improves the detection of hazard potentials. Modelling of hazardous processes based on geographic information systems (GIS) complements the remote sensing analyses towards an integrated assessment of glacier and permafrost hazards in mountains. Major present limitations in the application of remote sensing to glacier and permafrost hazards in mountains are, on the one hand, of technical nature (e.g. combination and fusion of different methods and data; improved unCorrespondence to: A. Kääb (kaeaeb@geo.unizh.ch) derstanding of microwave backscatter). On the other hand, better dissemination of remote sensing expertise towards institutions involved in high-mountain hazard assessment and management is needed in order to exploit the large potential of remote sensing in this field.

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Landslide hazard assessment in the Three Gorges area of the Yangtze River using ASTER imagery

Cited by 21 publications

References 3 publications

Evolution of the physico-chemical water quality in the Nam Theun 2 Reservoir and downstream rivers for the first 5 years after impoundment

Evolution of the physico-chemical water quality in the Nam Theun 2 Reservoir and downstream rivers for the first 5 years after impoundment

Characterization of Landslide Deformations in Three Gorges Area Using Multiple InSAR Data Stacks

Remote sensing of glacier- and permafrost-related hazards in high mountains: an overview

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