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An integrated approach for aquifer vulnerability mapping using GIS and rough sets: study from an alluvial aquifer in North India

Une approche intégrée pour cartographier la vulnérabilité d’un aquifère, basée sur un SIG et les ensembles approximatifs: étude d’un aquifère alluvial dans le Nord de l’Inde

Un enfoque integrado para el mapeo de la vulnerabilidad de un acuífero usando GIS y los conjuntos aproximados: estudio de un acuífero aluvial en el norte de la India

采用地理信息系统和粗集进行含水层脆弱性填图的一个综合方法:印度北部一个冲积含水层的研究实例

Uma aproximação integrada para o mapeamento da vulnerabilidade aquífera utilizando SIG e conjuntos irregulares: estudo de um aquífero aluvial no norte da Índia

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Abstract

A modified DRASTIC model in a geographic information system (GIS) environment coupled with an information-analytic technique called ‘rough sets’ is used to understand the aquifer vulnerability characteristics of a segment of the lower Kali watershed in western Uttar Pradesh, India. Since the region is a flat plain, topography (T) is removed as a potential control. Other parameters are the same as in DRASTIC, hence the new model is termed as DRASIC. The rough set technique is employed to provide insight into the relative vulnerabilities of different administrative units (blocks) within the study area. Using rough sets, three important factors are computed: strength, certainty and coverage. Strength indicates how the vulnerability characteristics vary in the entire area, certainty gives the relative fractions of low, medium and high vulnerability regions within a particular block, and coverage computes the percentage of a particular vulnerability state in each block. The purpose of the work is to demonstrate the utility of this integrated approach in classifying different administrative blocks in the study area according to their aquifer vulnerability characteristics. This approach is particularly useful for block-level planning and decision making for sustainable management of groundwater resources.

Résumé

Une approche DRASTIC modifiée intégrée dans un système d’information géographique (SIG), couplé avec une technique d’analyse des données nommée « ensembles approximatifs », est utilisée pour comprendre les caractéristiques de vulnérabilité de l’aquifère sur une partie du bassin versant du Kali inférieur, dans l’Ouest de l’Uttar Pradesh, en Inde. Comme la région est une plaine dénuée de relief, la topographie (T) est retirée des paramètres de contrôle. Les autres paramètres sont identiques à ceux de DRASTIC, de sorte que le la nouvelle approche est désignés sous le nom de DRASIC. La technique des ensembles approximatifs est utilisée pour apporter de la précision aux vulnérabilités relatives des différentes unités administratives (blocs), au sein de la zone d’étude. Utilisant les ensembles approximatifs, trois paramètres importants sont calculés: force, certitude et couverture. La force indique comment les caractéristiques de vulnérabilité varient dans l’ensemble de la zone, la certitude donne les fractions relatives des secteurs de vulnérabilité faible, moyenne et élevée, au sein d’un bloc particulier, et la couverture calcule le pourcentage d’un état de vulnérabilité particulier dans chaque bloc. L’objectif de ce travail est de démontrer l’utilité de cette approche intégrée pour classer les différents blocs administratifs de la zone d’étude, en fonction des caractéristiques de la vulnérabilité des aquifères. Cette approche est particulièrement utile pour une planification à l’échelle de chaque bloc et une prise de décision pour une gestion durable des ressources en eau souterraine.

Resumen

Se utilizó un modelo DRASTIC modificado en un ambiente de sistema de información geográfica (GIS) acoplado con la técnica de información analítica denominada ‘conjuntos aproximados’ para entender las características de la vulnerabilidad del acuífero de un segmento de la cuenca baja de Kali en el oeste de Uttar Pradesh, India. Puesto que la región es una planicie llana, la topografía (T) fue eliminada como un control potencial. Otros parámetros son los mismos que en el DRASTIC, por lo tanto el nuevo modelo es denominado como DRASIC. Se empleó la técnica de conjunto aproximada para proveer conocimientos más profundos de las vulnerabilidades relativas de las diferentes unidades administrativas (bloques) dentro del área de estudio. Usando conjuntos aproximados, se computaron los tres factores importantes: la solidez, la certeza y la cobertura. La solidez indica como varían las características de vulnerabilidad en el total del área, la certeza da la fracción relativa de las regiones de baja, media y alta vulnerabilidad dentro de un bloque particular, y la cobertura computa el porcentaje de un estado particular de vulnerabilidad en cada bloque. El propósito del trabajo es demostrar la utilidad de este enfoque integrado para clasificar diferentes bloques administrativos en el área de estudio de acuerdo a sus características de vulnerabilidad del acuífero. Este enfoque es particularmente útil para la planificación y la toma de decisión a nivel de bloque para el manejo sustentable de los recursos de agua subterránea.

摘要

与信息解析技术耦合的地理信息系统环境下改进DRASTIC模型被称为“粗集”,用于了解印度北方邦西部Kali流域下游某段含水层脆弱性特征。本地区是平坦的平原,因此,地形(T)不算做一个潜在的控制因素。其他参数与DRASTIC中的相同,因此,新的模型称为DRASIC。采用粗集技术可深入认识研究区内不同管理单元(区块)的相对脆弱性。采用粗集技术,要计算三个主要因素:强度、确定性和覆盖范围。强度是指脆弱性特征在整个地区是如何变化的,确定性表示特定区块内低、中、高脆弱性地区的相对系数,覆盖范围计算每个区块内特殊脆弱性状态的百分比。研究的目的就是展示这个综合方法在研究区根据含水层脆弱性特征对不同管理区块进行分类的使用性。这个方法对地下水资源可持续管理区块尺度的规划和决策特别有用

Resumo

Utiliza-se um modelo DRASTIC modificado num ambiente de sistema de informação geográfica (SIG) acoplado com uma técnica de informação analítica designada de “conjuntos irregulares” (“rough sets”) para perceber as caraterísticas de vulnerabilidade aquífera de um segmento da bacia hidrográfica do baixo Kali, no Uttar Pradesh ocidental, Índia. Dado que a região é uma planície, o parâmetro topografia (T) é retirado como controlo potencial. Os restantes parâmetros são os mesmos do DRASTIC, pelo que se designa o novo modelo como DRASIC. Utiliza-se a técnica dos conjuntos irregulares para dar uma visão das vulnerabilidades relativas de diferentes unidades administrativas (blocos) da área de estudo. Utilizando conjuntos irregulares, calculam-se três fatores importantes: força, certeza e cobertura. A força indica como as caraterísticas de vulnerabilidade variam na área inteira, a certeza dá as frações relativas das regiões de vulnerabilidade baixa, média ou alta dentro de um bloco particular, e a cobertura calcula a percentagem de um estado de vulnerabilidade particular em cada bloco. O objetivo do trabalho é demonstrar a utilidade da abordagem integrada na classificação de diferentes blocos administrativos na área de estudo, de acordo com as suas caraterísticas de vulnerabilidade aquífera. Esta abordagem é particularmente útil para planeamento e tomada de decisão, a nível de bloco, na gestão sustentável de recursos hídricos subterrâneos.

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Acknowledgements

The financial assistance received by the first author in the form of Senior Research Fellowship from University Grant Commission, New Delhi, is acknowledged. The authors are thankful to the reviewer Dr. Fernando A. L. Pacheco and an anonymous reviewer for their suggestions, which helped improve the manuscript.

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Khan, A., Khan, H.H., Umar, R. et al. An integrated approach for aquifer vulnerability mapping using GIS and rough sets: study from an alluvial aquifer in North India. Hydrogeol J 22, 1561–1572 (2014). https://doi.org/10.1007/s10040-014-1147-8

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