Evaluation of data for Sinkhole-development risk models

Upchurch, Sam B.; Littlefield, James R.

doi:10.1007/bf02574800

Cited by 23 publications

(10 citation statements)

References 2 publications

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“…Some authors have transformed sinkhole density maps into susceptibility maps assuming implicitly that the zones with a larger number of sinkholes or with a higher percentage area occupied by sinkholes are more prone to sinkhole formation (Ogden and Reger, 1977;Brook and Allison, 1986;Upchurch and Littlefield, 1988;Ragozin et al, 2005). Another option is to produce susceptibility zonations using the distance of each point to the nearest sinkhole (nearest neighbour distance).…”

Section: Introductionmentioning

confidence: 98%

Evaluating and comparing methods of sinkhole susceptibility mapping in the Ebro Valley evaporite karst (NE Spain)

et al. 2009

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Section: Introductionmentioning

confidence: 98%

Evaluating and comparing methods of sinkhole susceptibility mapping in the Ebro Valley evaporite karst (NE Spain)

et al. 2009

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“…It should be noted that the method does not a priori fix the criteria for assessing the collapse susceptibility of underground structures in general, but offers management tools once the most relevant of these have been identified. The quality of the obtained results depends entirely on the relevance of the selected criteria and thus on the understanding of the phenomena (Upchurch and Littlefield, 1988;Benson et al 2003;Hubbard, 2003;Brinkmann et al, 2008). Although the method endeavours to control and limit the subjectivity of expert judgement, the expertise is still the central point.…”

Section: Concluding Remarks and Discussionmentioning

confidence: 99%

“…1), the expert, on the basis of his experience and his regional knowledge, synthesizes and interprets the commonly imprecise, if not vague, information obtained from the inventory and the geological and historicaleconomic contexts. As several authors have already pointed out relative to all types of underground structure (Upchurch and Littlefield, 1988;Benson et al 2003;Hubbard, 2003;Brinkmann et al, 2008), the essential aspect of the expertise is the identification of the theoretical controlling factors regulating the occurrence of the disturbances, i.e. the equivalent of the step 2 of the methodology.…”

Section: 3mentioning

confidence: 99%

Managing expert-information uncertainties for assessing collapse susceptibility of abandoned underground structures

Nachbaur¹,

Rohmer²

2011

Engineering Geology

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Assessing the collapse susceptibility of abandoned cavities at a regional scale is associated with large uncertainties that are mainly related to the very nature of the phenomena, but also to the difficulty in collecting exhaustive information at such a scale on often "forgotten" structures. In this context, the expert's role is essential, because he is able to synthesize the information resulting from the inventory and from the commonly imprecise, if not vague, criteria on the basis of his experience and his knowledge of the regional geological and historical and economic context. In this article, we propose mathematical tools for representing and processing this information in order to give flexibility to this step and manage the uncertainty inherent in the expert's information. The first tool, based on the weight of evidence theory, is for managing the uncertainty due to the heterogeneous spatial distribution of the data, whereas the second tool, based on the fuzzy set theory, is for managing the imprecision and incompleteness of available data, which hinder the definition of the class boundaries of the quantitative decision criteria. Based on an appropriate representation of the uncertainty sources (related to the input data and to the expert diagnostic), we then propose a methodology that integrates the uncertainty in the final output of the collapse susceptibility assessment and provides a confidence indicator useful within the decision-making process. The proposed methodology is applied to the Arras territory in the North of France, where abandoned chalk pits (dating back to the Roman ages) and war saps (i.e. covered trenches) located in the vicinity of the First World War front lines both raise difficulties for urban planning

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“…According to the literature on this theme, thickness of cover plays an important role (Palmquist, 1979;Lamoreaux & Newton, 1986;Yuan, 1988;White & White, 1986;Upchurch & Littlefield, 1988). From the data obtained from drillings made in this area it is possible to determine with accuracy the variation of the thickness of the Quaternary materials.…”

Section: Physical Factorsmentioning

confidence: 98%

Alluvial sinkholes over gypsum in the Ebro basin (Spain): genesis and environmental impact

Soriano

Simon

Gracia

et al. 1994

Hydrological Sciences Journal

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The Ebro Basin is located in the northeast of Spain. Its central part is filled with gypsum and carbonate deposits of Neogene age. Quaternary sediments overlie the Tertiary layers. Alluvial sinkholes have developed in this region, causing high economic losses. From the study of aerial photographs, from the compilation of historical cases of collapse and from data on the lithological characteristics of the Quaternary and Tertiary deposits (their structure, morphology, hydrological characteristics, etc.), natural and human factors in sinkhole development have been evaluated. Among the natural variables that may be considered are the lithology of the Tertiary deposits, the thickness and geomechanical behaviour of the Quaternary cover, the morphology of the contact between the Tertiary and Quaternary deposits, fracturing, content of sulphates in groundwater and the depth and seasonal variations of the groundwater level. The irrigation techniques of farmers and the presence of irrigation canals increase the level of the groundwater. Pumping activities may also be important locally.Dolines alluviales générées par les gypes de la dépression de PEbre (Espagne): facteurs génériques et impact sur l'environnement Résumé La dépression de l'Ebre est localisée dans le nordest de l'Espagne. Pendant le Miocène sa partie centrale a été remplie par des gypses et des carbonates. Des sédiments quaternaires recouvrent les gypses. Des dolines alluviales se sont développées, produisant d'importantes pertes économiques. A partir de l'étude de photographies aériennes, de la compilation de cas historiques et de données sur les caractéristiques lithologiques, structurales, morphologiques, hydrologiques, etc, nous avons déterminé les principaux facteurs (naturels et humains) qui sont à l'origine de la formation des dolines. Les facteurs naturels sont: la lithologie du Tertiaire, l'épaisseur et le comportement géomécanique de la couverture quaternaire, la morphologie du contact entre les dépôts tertiaire et quaternaire, la fracturation, le contenu en sulfates des eaux souterraines et la profondeur et les variations saisonnières du niveau de ces eaux. Les techniques d'irrigation des agriculteurs et l'existence de canaux d'irrigation provoquent une remontée du niveau des eaux souterraines. Le pompage de l'eau peut également être important dans certaines zones.

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Evaluation of data for Sinkhole-development risk models

Cited by 23 publications

References 2 publications

Evaluating and comparing methods of sinkhole susceptibility mapping in the Ebro Valley evaporite karst (NE Spain)

Evaluating and comparing methods of sinkhole susceptibility mapping in the Ebro Valley evaporite karst (NE Spain)

Managing expert-information uncertainties for assessing collapse susceptibility of abandoned underground structures

Alluvial sinkholes over gypsum in the Ebro basin (Spain): genesis and environmental impact

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