NDLI: Groundwater travel time computation for two-layer islands

Content Provider	Springer Nature Link
Author	Ketabchi, Hamed Mahmoodzadeh, Davood Ataie Ashtiani, Behzad
Copyright Year	2016
Abstract	A closed-form analytical computation of groundwater travel time (GWTT) for two-layer oceanic small island aquifers is developed assuming steady-state and sharp-interface conditions. The two-layer geology impacts on the GWTT are investigated using the developed analytical solution to achieve a greater transparency of such conceptualizations. The results demonstrate that the inclusion of geologic layering leads to large changes in the GWTT. Sensitivity analyses, using specified dimensionless parameters, are employed to assess the influences of hydraulic conductivity, recharge rate, upper layer thickness, and seawater/freshwater density difference parameters, which influence the GWTT. These evaluations reveal that the GWTT is mainly influenced by the recharge rate and the upper layer thickness compared to the other influential parameters when the typical parameter ranges are considered.Un calcul analytique de forme fermée pour le temps de transfert des eaux souterraines au sein des aquifères bi-chouches insulaires est développé considérant des conditions d’écoulements permanents et une interface nette. Les impacts de deux couches géologiques sur le temps de transfert des eaux souterraines sont étudiées en utilisant la solution analytique développée afin d’atteindre une plus grande transparence sur ce type de conceptualisations. Les résultats démontrent que l’intégration de couches géologiques conduit à des grandes variations dans les temps de transfert. Des analyses de sensibilité, utilisant des paramètres spécifiques adimensionnels, sont employées pour évaluer les influences de la conductivité hydraulique, du taux de recharge, de l’épaisseur de la couche supérieure, et des paramètres associés à la différence de densité de l’eau douce et de l’eau de mer, sur le temps de transfert. Ces évaluations montrent que le temps de transfert est principalement influencé par le taux de recharge et l’épaisseur de la couche supérieure par rapport aux autres paramètres influents, si les ordres de grandeurs typiques des paramètres sont considérés.Se desarrolla un cálculo analítico de forma cerrada del tiempo de tránsito del agua subterránea (GWTT) para acuíferos de dos capas en pequeñas islas oceánicas asumiendo condiciones de régimen permanente y una nítida interfaz. Se investigan los impactos de la geología de dos capas en la GWTT utilizando la solución analítica desarrollada para lograr una mayor transparencia en este tipo de conceptualizaciones. Los resultados demuestran que la inclusión de estratificación geológica conduce a grandes cambios en la GWTT. Se emplean análisis de sensibilidad, utilizando los parámetros adimensionales especificados, para evaluar la influencia de la conductividad hidráulica, la tasa de recarga, el espesor de la capa superior, y los parámetros de la diferencia de densidad agua de mar/agua dulce, que influyen sobre la GWTT. Dichas evaluaciones revelan que la GWTT está influenciada principalmente por la tasa de recarga y el espesor de la capa superior en comparación con los otros parámetros influyentes cuando se consideran los intervalos típicos de los parámetros.假设在稳定态和清晰界面条件下,对双层的太平洋小岛含水层地下水的迁移时间进行了封闭式的解析计算。采用成熟的解析方法研究了双层的地质条件对地下水迁移时间的影响,达到了此类概念模型更大的透明度。结果显示,地质上分层导致地下水迁移时间上有很大变化。采用规定的无量纲参数,灵敏度分析结果用来评价水力传导率、补给率、上层厚度和海水/淡水密度差参数的影响,这些参数都对地下水迁移时间有影响。这些评价结果揭示,当考虑典型参数范围时,与其它影响参数相比,地下水迁移时间主要受补给率和上层厚度的影响.محاسبه زمان پیمایش آب زیرزمینی برای آبخوان های دولایه در جزایر کوچک اقیانوسی با فرض شرایط دائمی و سطح مشترک اختلاط ناپذیر توسعه داده می شود. آثار دولایه بودن محیط بر زمان پیمایش آب زیرزمینی با استفاده از حل تحلیلی توسعه داده شده مورد بررسی قرار می گیرد تا دید بهتر و دقیق تری از چنین مفهوم سازی هایی حاصل گردد. نتایج نشان می دهد که ملحوظ نمودن لایه بندی، تغییرات قابل توجهی را در زمان پیمایش آب زیرزمینی سبب می شود. تحلیل حساسیت ها با استفاده از مشخصه های بی بعد برای ارزیابی آثار مشخصه های مؤثر بر زمان پیمایش آب زیرزمینی، هدایت هیدرولیکی، نرخ تغذیه، ضخامت لایه فوقانی و تغییرات چگالی آب دریا/آب شیرین، انجام می پذیرد. این بررسی ها نشان می دهد که دربازه معمول مشخصه های مورد نظر، زمان پیمایش آب زیرزمینی در مقایسه با سایر عوامل مؤثر، بیشتر از نرخ تغذیه و ضخامت لایه فوقانی متأثر است.Neste trabalho foi desenvolvida uma formula analítica de forma fechada do tempo de trânsito de água subterrânea (TTAS) para aquíferos de ilhas pequenas no oceano, assumindo-se regime permanente e intrusão salina em ângulo agudo. A solução aqui desenvolvida foi utilizada para investigar os impactos da geologia de duas camadas no TTAS como estratégia para obter maior sensibilidade acerca do modelo conceitual. Os resultados demonstram que a inclusão da segunda camada no modelo acarreta em grandes mudanças no TTAS. Foi realizada análise de sensibilidade utilizando-se de parâmetros adimensionais para avaliar a influência da condutividade hidráulica, taxa de recarga, espessura da camada superior e diferença de densidade entre água doce e água do mar, os quais afetam o TTAS. Foi obtido que a taxa de recarga e a espessura da camada superior afetam o TTAS majoritariamente, se comparados aos demais parâmetros em termos da amplitude típica dos valores de cada parâmetro.
Starting Page	1045
Ending Page	1055
Page Count	11
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	24
Issue Number	4
e-ISSN	14350157
Language	Portuguese
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-01-08
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Analytical solutions Groundwater travel time Island hydrology Two-layer aquifer Hydrogeology Hydrology/Water Resources Geology Water Quality/Water Pollution Geophysics/Geodesy Waste Water Technology Water Pollution Control Water Management Aquatic Pollution
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Groundwater response to tidal fluctuations in wedge-shaped confined aquifers

Hydrogeological typologies of the Indo-Gangetic basin alluvial aquifer, South Asia

Automatic estimation of aquifer parameters using long-term water supply pumping and injection records

Sources of high-chloride water and managed aquifer recharge in an alluvial aquifer in California, USA

Groundwater travel times for unconfined island aquifers bounded by freshwater or seawater

Aquifer design for freshwater storage and recovery in artificial islands and coastal expansions

The invertebrate ecology of the Chalk aquifer in England (UK)

Overview of groundwater for emergency use and human security

Preface: Hydrogeology and human health

Groundwater travel time computation for two-layer islands

Similar Documents

Groundwater response to tidal fluctuations in wedge-shaped confined aquifers

Hydrogeological typologies of the Indo-Gangetic basin alluvial aquifer, South Asia

Automatic estimation of aquifer parameters using long-term water supply pumping and injection records

Sources of high-chloride water and managed aquifer recharge in an alluvial aquifer in California, USA

Groundwater travel times for unconfined island aquifers bounded by freshwater or seawater

Aquifer design for freshwater storage and recovery in artificial islands and coastal expansions

The invertebrate ecology of the Chalk aquifer in England (UK)

Overview of groundwater for emergency use and human security

Preface: Hydrogeology and human health

Groundwater travel time computation for two-layer islands