Improved regional groundwater flow modeling using drainage features: a case study of the central northern karst aquifer system of Puerto Rico (USA) | Verbesserte regionale Grundwassermodellierung durch die Verwendung von “Drainage Features” am Beispiel des zentralen nördlichen Karstaquifersystems in Puerto Rico (USA) Amélioration de la modélisation régionale de l’écoulement des eaux souterraines utilisant des caractéristiques de drainage: une étude de cas avec le système aquifère karstique du centre nord de Puerto Rico (Etats-Unis d’Amérique) Mejoramiento de los modelados de flujo regional de agua subterránea utilizando características del drenaje: un estudio de caso del sistema acuífero kárstico del centro norte de Puerto Rico (EE.UU.) 利用排水特征进行区域地下水流的改进性模拟:(美国)波多黎各岩溶含水层系统中北部的研究案例 مدلسازی ناحیه ای آب زیرزمینی بهینه یافته با استفاده از خاصیت زهكشی: مطالعه موردی سیستم آبخوان كارستی مركزی شمال جزیره پورتوریكو، آمریكا Melhoria da modelagem de fluxo regional de água subterrânea utilizando características de drenagem: um estudo de caso do sistema aquífero cárstico central do norte de Porto Rico (EUA)
2016
Ghasemizadeh, Reza | Yu, Xue | Butscher, Christoph | Padilla, Ingrid Y. | Alshawabkeh, Akram
In northern Puerto Rico (USA), subsurface conduit networks with unknown characteristics, and surface features such as springs, rivers, lagoons and wetlands, drain the coastal karst aquifers. In this study, drain lines connecting sinkholes and springs are used to improve the developed regional model by simulating the drainage effects of conduit networks. Implemented in an equivalent porous media (EPM) approach, the model with drains is able to roughly reproduce the spring discharge hydrographs in response to rainfall. Hydraulic conductivities are found to be scale dependent and significantly increase with higher test radius, indicating scale dependency of the EPM approach. Similar to other karst regions in the world, hydraulic gradients are steeper where the transmissivity is lower approaching the coastline. This study enhances current understanding of the complex flow patterns in karst aquifers and suggests that using a drainage feature improves modeling results where available data on conduit characteristics are minimal.
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