Abstract
The capital city of Afghanistan, Kabul, has experienced rapid urbanization since the end of 2001. The aim of this study is to evaluate the impact of rapid urbanization on the Kabul aquifer system, which is the main source of water for domestic, agricultural and industrial use in the area. Satellite imagery, groundwater levels and rainfall historical data were analyzed in conjunction with physico-chemical parameters that were measured at 27 water wells located in the Kabul Plain in 2020. Land-cover maps indicate that the urban surface area increased by 40% between 2000 and 2020, whilst the agricultural surface area simultaneously decreased by 32%. Meanwhile the Kabul Plain has globally experienced a severe decrease in groundwater levels (-0.8 m/year on average, and a fall of 60 m in some places) due to overabstraction, which has also seen changes in groundwater flow directions. Hydrochemistry, on the other hand, reveals that chloride concentrations and salinity increased throughout the aquifer between 2005 and 2020, while the nitrate concentration decreased in most places of the Kabul Plain over the considered period. The results suggest that rapid urbanization has had serious detrimental effects on both groundwater quantity and quality. Without urgent preventive policy and the implementation of effective practices, groundwater resource depletion and groundwater quality deterioration in the Kabul shallow aquifers are likely to continue in the future.
Résumé
La capitale de l’Afghanistan, Kaboul, connaît une urbanisation rapide depuis la fin de l’année 2001. L’objectif de cette étude est d’évaluer l’impact de l’urbanisation rapide de l’aquifère de Kaboul, qui constitue la source principale d’eau pour les usages domestiques, agricoles et industriels dans la région. Les images satellites, les niveaux des eaux souterraines et les données historiques des précipitations ont été analysés conjointement avec les paramètres physico-chimiques qui ont été mesurés dans 27 puits d’eau situés dans la plaine de Kaboul en 2020. Les cartes d’occupation des sols indiquent que la surface urbaine a augmenté de 40% entre les années 2000 et 2020, tandis que la superficie des terrains agricoles simultanément a diminué de 32%. Entre temps, la plaine de Kaboul a globalement connu une grave diminution du niveau des eaux souterraines (–0.8 m/an en moyenne, et avec une chute de 60 m en certains endroits) liée à la surexploitation, qui a également entraîné des modifications dans les directions d’écoulement des eaux souterraines. L’hydrochimie, quant à elle, révèle que les concentrations de chlorure et la salinité ont augmenté dans l’ensemble de l’aquifère entre les années 2005 et 2020, tandis que la concentration en nitrate a diminué dans la plupart des endroits de la plaine de Kaboul au cours de la période considérée. Les résultats suggèrent que l’urbanisation rapide a eu de sérieux effets néfastes sur la quantité et la qualité des eaux souterraines. Sans une politique préventive urgente et la mise en œuvre de pratiques efficaces, l’épuisement des ressources en eau souterraine et la détérioration de la qualité des eaux souterraines dans les aquifères peu profonds de Kaboul risquent de se poursuivre à l’avenir.
Resumen
La capital de Afganistán, Kabul, ha experimentado una rápida urbanización desde el comienzo del gobierno post-talibán a fines de 2001. El objetivo de este estudio es evaluar el impacto de la rápida urbanización en el acuífero de Kabul, que es la principal fuente de agua para uso doméstico, agrícola e industrial de la zona. Se analizaron las imágenes de satélite, los niveles de las aguas subterráneas y los datos históricos de las precipitaciones junto con los parámetros físico-químicos que se midieron en 27 pozos de agua situados en la llanura de Kabul en 2020. Los mapas de uso del suelo indican que la superficie urbana aumentó un 40% entre 2000 y 2020, mientras que la superficie agrícola disminuyó simultáneamente un 32%. Mientras tanto, la llanura de Kabul ha experimentado globalmente un grave descenso del nivel de las aguas subterráneas (–0.8 m/año de media, y una caída de 60 m en algunos lugares) debido a la sobreexplotación, que también ha visto cambiar las direcciones del flujo de las aguas subterráneas. La hidroquímica, por su parte, revela que las concentraciones de cloruro y la salinidad aumentaron en todo el acuífero entre 2005 y 2020, mientras que la concentración de nitrato disminuyó en la mayoría de los lugares de la llanura de Kabul durante el periodo considerado. Los resultados sugieren que la rápida urbanización ha tenido graves efectos perjudiciales tanto en la cantidad como en la calidad de las aguas subterráneas. Sin una urgente política preventiva y la aplicación de prácticas adecuadas, es probable que el agotamiento de los recursos hídricos subterráneos y el deterioro de su calidad en los acuíferos poco profundos de Kabul continúen en el futuro.
摘要
自2001年末以来, 阿富汗首都喀布尔经历了快速的城市化。本研究旨在评估快速的城市化对喀布尔含水层 (该区生活用水、农业用水和工业用水的主要水源) 的影响。2020年, 结合喀布尔平原27眼水井的物理化学参数, 对卫星影像、地下水位和历史降水数据进行了分析。土地覆盖图显示, 在2000年至2020年间, 喀布尔城市用地面积增加了40%, 而农业用地面积同时减少了32%。与此同时, 由于地下水过度抽取, 喀布尔平原经历了严重的全域地下水位下降 (平均–0.8 米/年, 一些地方水位下降可达60米), 地下水流向也因此发生了改变。另一方面, 水化学结果显示, 2005年至2020年间整个含水层的氯离子浓度和盐度增加, 而喀布尔平原大部分地区的硝酸根离子浓度降低。结果表明, 快速的城市化对地下水水量和水质均造成了严重的威胁。如果没有紧急预防政策和有效的实施措施, 喀布尔浅层含水层地下水资源枯竭和地下水水质恶化很可能今后还将持续。
چکیده
کابل پایتخت افغانستان پس از پایان سال ۲۰۰۰ میلادی شهرنشینی سریع را تجربه کرده است. هدف این پژوهش ارزیابی تأثیر شهرنشینی سریع بر آبخوان کابل می باشد که منبع اصلی آب برای مصارف خانگی، کشاورزی است. تصاویر ماهوارهای، دادههای سطح ایستابی و بارندگی همراه با پارامترهای فیزیکی و شیمیایی ۲۷ حلقه چاه آب واقع دشت کابل که در سال ۲۰۲۰ سنجش شده اند، مورد تجزیه و تحلیل قرار گرفته اند. نقشههای پوشش اراضی نشان میدهند که بین سالهای ۲۰۰۰ تا ۲۰۲۰ پوشش اراضی شهری ۴۰ درصد افزایش یافته، درحالیکه ۳۲ درصد پوشش اراضی کشاورزی تدریجاً کاهش یافته است. درعین حال دشت کابل به علت بر داشت بیش از حد، افت شدید سطح ایستابی (بهطور میانگین ۸/۰ متر و افت ۶۰ متر در برخی جاها) را تجربه کرده است و شاهد تغییر جریان آب زیرزمینی نیز بوده است. نتایج نشان میدهد که شهرنشینی سریع اثرات نامطلوب جدی بر کمیت و کیفیت آب زیرزمینی داشته است. بدون راهکار پیشگیرانه فوری و تطبیق روشهای مؤثر، کاهش منابع آب زیرزمینی و بدتر شدن کیفیت آب زیرزمینی آبخوانهای کم عمق کابل در آینده ادامه خواهد یافت.
Resumo
A capital do Afeganistão, Cabul, tem experimentado uma rápida urbanização desde o final de 2001. O objetivo deste estudo é avaliar o impacto da rápida urbanização no aquífero de Cabul, que é a principal fonte de água para uso doméstico, agrícola e industrial na área. Imagens de satélite, níveis de águas subterrâneas e dados históricos de chuvas foram analisados em conjunto com parâmetros físico–químicos que foram medidos em 27 poços localizados na planície de Cabul em 2020. Mapas de ocupação da terra indicam que a área de superfície urbana aumentou 40% entre 2000 e 2020, enquanto a área de superfície agrícola diminuiu simultaneamente em 32%. Enquanto isso, a planície de Cabul tem experimentado globalmente uma severa redução nos níveis de águas subterrâneas (–0.8 m/ano em média, e uma queda de 60 m em alguns lugares) devido à superexplotação, que também tem demonstrado mudanças nas direções de fluxo de águas subterrâneas. A hidroquímica, por outro lado, revela que as concentrações de cloreto e a salinidade aumentaram ao longo do aquífero entre 2005 e 2020, enquanto a concentração de nitrato diminuiu na maioria dos locais da planície de Cabul durante o período considerado. Os resultados sugerem que a rápida urbanização teve sérios efeitos prejudiciais tanto na quantidade quanto na qualidade das águas subterrâneas. Sem uma política preventiva urgente e a implementação de práticas eficazes, o esgotamento dos recursos hídricos subterrâneos e a deterioração da qualidade das águas subterrâneas nos aquíferos rasos de Cabul provavelmente continuarão no futuro.
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Acknowledgements
The authors express sincere thanks to the Ministry of Energy and Water of Afghanistan and Afghanistan Civil Aviation Authority (ACAA) for providing rainfall and groundwater level data of the city of Kabul. The authors thank the US Geological Survey (USGS) for sharing hydrochemical data of Kabul Basin. Also, the authors would like to acknowledge two anonymous reviewers for their careful review and their constructive comments and suggestions.
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Zaryab, A., Nassery, H.R. & Alijani, F. The effects of urbanization on the groundwater system of the Kabul shallow aquifers, Afghanistan. Hydrogeol J 30, 429–443 (2022). https://doi.org/10.1007/s10040-021-02445-6
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DOI: https://doi.org/10.1007/s10040-021-02445-6