NDLI: Numerical modeling of the effects of beach slope on water-table fluctuation in the unconfined aquifer of Donghai Island, China

Content Provider	Springer Nature Link
Author	Zhou, Pengpeng Li, Guomin Lu, Yaodong Li, Ming
Copyright Year	2013
Abstract	Beach slope is an important factor influencing the tide-induced water-table fluctuation in coastal unconfined aquifers. However, research about the effect of beach slope on water-table fluctuation is limited, especially for gentle slopes. To understand the effect of beach slope on beach groundwater dynamics, a numerical model, calibrated with field monitoring data from Donghai Island (China), was built to simulate the observed water-table fluctuation. Sensitivity analysis was performed to assess the sensitivity of water-table fluctuation to the parameters and conceptualization of the model. The analysis indicated that the water-table fluctuation was especially sensitive to the hydraulic conductivity and specific yield, and the horizontal length of the model domain could affect the amplitude of the water-table fluctuation. Moreover, it is found that the variation of the amplitude is more evident when the beach-slope angle changes in the range from 1.5 to 45°, especially in the range from 1.5 to 5°. Understanding the effect of beach slope on tide-induced water-table dynamics could help modelers deal with the slope better in their beach groundwater flow models.La pente du rivage est un facteur important influençant les fluctuations de la nappe libre des aquifères côtiers non confinés. Toutefois, la recherche montre que l’effet de pente du rivage sur la fluctuation de l’aquifère est limitée, particulièrement pour les pentes douces. Pour comprendre l’effet de pente du rivage sur la dynamique de la nappe côtière, un modèle numérique étalonné avec des relevés de terrain sur l’Ile Donghai (Chine), a été élaboré pour simuler la fluctuation observée de la surface libre de la nappe. Une analyse de sensibilité a été réalisée pour évaluer l’incidence la fluctuation de la surface libre sur les paramètres du modèle. L’analyse indique que la fluctuation de la nappe est particulièrement sensible à la conductivité hydraulique et à la porosité efficace, et que la longueur du domaine modélisé peut affecter l’amplitude de fluctuation de la nappe. De plus, on a trouvé que l’amplitude de la variation est plus évidente quand la pente du rivage varie entre 1.5 et 45°, et particulièrement entre 1.5 et 5°. Comprendre l’effet de la pente du rivage sur la dynamique de nappe induite par la marée pourrait aider les modélisateurs à mieux prendre en compte la pente dans les modèles d’écoulement souterrain côtiers.La pendiente de la playa es un factor importante que influye en la fluctuación del nivel freático inducida por la marea en acuíferos costeros no confinados. Sin embargo, la investigación acerca de los efectos de la pendiente de la playa en la fluctuación del nivel freático está limitada, especialmente para pendiente suaves. Para entender los efectos de la pendiente de la playa sobre la dinámica del agua subterránea de la playa, se construyó un modelo numérico, calibrado con datos del monitoreo de campo de la Isla Donghai (China), para simular las fluctuaciones observadas en el nivel freático. Se realizaron análisis de sensibilidad para evaluar la sensibilidad de la fluctuación del nivel freático a los parámetros y a la conceptualización del modelo. El análisis indicó que la fluctuación del nivel freático fue especialmente sensible a la conductividad hidráulica y al almacenamiento específico, y a la longitud horizontal del dominio del modelo que podría afectar la amplitud de la fluctuación del nivel freático. Más aún, se encontró que la variación de la amplitud es más evidente cuando el ángulo de pendiente de la playa cambia en el intervalo de 1.5 a 45°, especialmente en el intervalo de 1.5 a 5°. Entender el efecto de la pendiente de la playa sobre la dinámica del nivel freático inducido por la marea podría ayudar a los modeladores a enfrentar mejor la pendiente de la playa en sus modelos de flujo del agua subterránea.滨海海滩坡度是影响潮汐引起的潜水水位波动的一个重要因素. 然而. 关于滨海潜水水位波动斜坡效应的研究却较为有限. 而且关于低缓斜坡条件下的潜水水位波动斜坡效应的研究更是有限. 为了认知海滩坡度对潜水水位波动的影响规律. 以中国东海岛为例. 作者建立了一个剖面二维地下水水流数值模型用以模拟研究区的潜水水位波动特征. 同时利用研究区水位动态实测数据对该数值模型进行了校准. 另外. 为了分析模型参数和概化条件对水位波动的影响程度. 作者进行了灵敏度分析. 灵敏度分析结果表明. 含水层渗透系数和给水度对水位波动的影响最为显著. 另外. 模型的长度也会影响到水位波动的波幅. 海滩斜坡效应的分析结果表明. 当海滩坡度在1.5°至45°之间变化时. 水位波动的波幅变化较为显著. 尤其当海滩坡度在1.5°至5°之间变化时. 波幅的变化更为明显. 本次对潮汐引起的潜水水位波动的斜坡效应研究. 不仅可以认知到海滩坡度对水位动态的影响规律. 而且可以为从事滨海区地下水动态数值模拟研究工作的研究者在概化海滩斜坡时提供理论依据和帮助.O declive de praia é um fator importante que influencia a flutuação da água subterrânea induzida pelas marés em aquíferos freáticos costeiros. No entanto, a investigação do efeito do declive de praia sobre a flutuação do nível freático tem sido limitada, especialmente para declives suaves. Para entender o efeito do declive de praia na dinâmica da água subterrânea nas praias, foi construído um modelo numérico, calibrado com dados de monitorização de campo da Ilha de Donghai (China), para simular a flutuação observada do nível freático. Foram realizadas análises de sensibilidade, a fim de avaliar a sensibilidade da flutuação do nível freático aos parâmetros e concetualização do modelo. As análises indicaram que a flutuação do nível freático era especialmente sensível à condutividade hidráulica e ao caudal específico e que a extensão horizontal do domínio do modelo pode afetar a amplitude de flutuação do nível freático. Para além disso, verificou-se que a variação de amplitude é mais evidente quando o ângulo de declive da praia varia de 1.5 a 45°, especialmente na gama dos 1.5 a 5°. O entendimento do efeito do declive de praia na dinâmica dos níveis freáticos induzidos por marés pode ajudar os modeladores a lidar melhor com os seus modelos de fluxo de águas subterrâneas em zonas de praia.
Starting Page	383
Ending Page	396
Page Count	14
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	22
Issue Number	2
e-ISSN	14350157
Language	Portuguese
Publisher	Springer Berlin Heidelberg
Publisher Date	2013-10-12
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Beach slope Sensitivity analysis Water-table fluctuation Numerical modeling China Hydrogeology Hydrology/Water Resources Geology 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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