NDLI: Heat transport in a coastal groundwater flow system near De Panne, Belgium

Content Provider	Springer Nature Link
Author	Vandenbohede, Alexander Lebbe, Luc
Copyright Year	2011
Abstract	Temperature distribution and heat transport are studied in a coastal aquifer at De Panne in the western Belgian coastal plain. Field observations include temperature profiles of groundwater in the dunes and temperature measurements at the water table in a profile on the shore. Freshwater–saltwater distribution is known from previous studies. These are used to constrain a density-dependent model simulating the freshwater–saltwater distribution and heat transport using the SEAWAT code. The yearly fluctuation of the groundwater temperature in the phreatic aquifer under the dunes, shore and sea, and the influence of a tidal inlet in the dunes are simulated. The observations show that seawater temperature variations determine the temperature variations on the shore whereas atmospheric temperature changes determine this in the dunes. Yearly temperature fluctuations imposed at the water table propagate mainly vertically in the aquifer with only limited lateral influence. Heat transport is mainly convection dominated. Thickness of the surficial zone is determined by the amplitude of the groundwater temperature at the water table and the groundwater flow. Establishment of a tidal inlet in the dunes results in asymmetric temperature profiles under and in the vicinity of it.La distribution de la température et le transport de chaleur sont étudiés dans un aquifère côtier à De Panne, dans la plaine côtière de l’Ouest de la Belgique. Les observations de terrain comprennent des profils de température de l’eau souterraine dans les dunes et des mesures de température de la nappe selon un profil sur la côte. La répartition entre l’eau douce et l’eau salée est connue par des études antérieures. Ces dernières sont utilisées pour caler un modèle prenant en compte la densité, simulant l’interface eau douce-eau salée et les transferts de chaleur à partir du code SEAWAT. La fluctuation annuelle de la température de l’eau de la nappe phréatique dans les dunes, la côte et la mer, ainsi que l’influence de l’invasion des dunes par la marée sont simulées. Les observations montrent que les variations de la température de l’eau de mer déterminent les variations de température au niveau côtier alors que les variations de température atmosphérique déterminent celles de l’eau souterraine dans les dunes. Des fluctuations annuelles de température imposées à la surface de la nappe se propagent essentiellement verticalement avec une influence latérale limitée. Le transport de chaleur est principalement dominé par la convection. L’épaisseur de la zone saturée est déterminée par l’amplitude thermique de la surface libre et par le débit souterrain. L’invasion d’eau de mer dans les dunes sous l’effet de la marée aboutit à des profils asymétriques de température sous et au voisinage de ces dunes.Se estudia la distribución de la temperatura y el transporte de calor en un acuífero costero en De Panne en la llanura costera belga occidental. Las observaciones de campo incluyen perfiles de temperatura de las aguas subterráneas en las dunas y mediciones de la temperatura en la capa freática en un perfil sobre la costa. La distribución de agua dulce – agua salada se conoce a partir de estudios previos. Estos son usados para restringir un modelo dependiente de la densidad que simula la distribución del agua dulce – agua salada y el transporte de calor usando el código SEAWAT. Se simulan la fluctuación anual de la temperatura del agua subterránea en el acuífero freático bajo las dunas, costa y mar y la influencia de un ingreso de marea en las dunas. Las observaciones muestran que las variaciones de temperatura del agua de mar determinan las variaciones de temperatura en la costa, mientras que los cambios de la temperatura atmosférica la determinan en las dunas. Las fluctuaciones de temperatura anual impuestas en la capa freática se propagan principalmente en forma vertical en el acuífero con sólo una limitada influencia lateral. El transporte de calor es principalmente dominado por la convección. El espesor de la zona no saturada está determinado por la amplitud de la temperatura del agua subterránea en el agua freática y en el flujo subterráneo. El establecimiento de un ingreso de la marea en las dunas da como resultado perfiles de temperatura asimétricos por debajo de él y en su proximidad.本文报道比利时海岸平原西部的De Panne海岸含水层中温度分布和热传输研究。野外观测包括沙丘地下水的温度垂向分布以及陆上钻孔地下水位处的温度。用已知的咸淡水分布标定基于密度的数值模型, 应用SEAWAT程序模拟咸淡水分布及热传输。模拟了沙丘、海滨以及海水之下的潜水含水层中地下水温度年际波动以及沙丘进潮口的影响。结果显示, 海水温度变化控制着海滨地下水的温度变化, 而大气温度变化控制着沙丘的地下水温度变化。地下水位处得年际温度波动在含水层中以垂向传播为主而侧向的影响范围有限。热传递以对流为主。浅成带厚度由地下水面处的地下水温度的变化幅度及地下水径流决定。沙丘进潮口的确定导致其下及附近的温度曲线的不对称分布。A distribuição da temperatura e o transporte de calor foram estudados num aquífero costeiro em De Panne, na planície costeira do oeste da Bélgica. As observações de campo incluem perfis de temperatura da água subterrânea nas dunas e medições de temperatura no aquífero freático ao longo de um perfil na margem marítima. A distribuição de água doce e água salgada é conhecida a partir de estudos prévios. Esta foi usada para definir as condições de contorno de um modelo com densidade variável que simula a distribuição de água doce e água salgada e o transporte de calor usando o código SEAWAT. São simuladas a flutuação anual da temperatura da água subterrânea no aquífero freático subjacente às dunas, na margem marítima e sob o mar, e a influência de um canal de maré nas dunas. As observações indicam que as variações da temperatura do mar determinam as variações da temperatura na margem marítima, enquanto as mudanças de temperatura atmosférica determinam as variações nas dunas. As flutuações anuais de temperatura, impostas no nível freático, propagam-se sobretudo verticalmente no aquífero, com uma influência lateral limitada. O transporte de calor é maioritariamente dominado pela convecção. A espessura da zona superficial é determinada pela amplitude da temperatura da água subterrânea no nível freático e pelo escoamento subterrâneo. O desenvolvimento de um canal de maré nas dunas origina perfis assimétricos de temperatura, debaixo e nas imediações do canal.
Starting Page	1225
Ending Page	1238
Page Count	14
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	19
Issue Number	6
e-ISSN	14350157
Language	Portuguese
Publisher	Springer-Verlag
Publisher Date	2011-07-06
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Coastal aquifers Heat transport Surficial zone Tidal inlet Belgium Geology Hydrogeology 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

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