Abstract

There is mounting evidence that the increasing size of the construction industry may lead to significant changes in the global environment. Dewatering, as a crucial component of the construction industry, may have detrimental consequences on the soil and groundwater quality. Dewatering is a technique used to lower the high-water table during construction. The possible effects of dewatering on the soil and ground water quality were visualized and investigated using GIS technology. The analyses were conducted at small temporal and spatial scales. The aim is to give insights in the magnitude and the direction of the dewatering’s impacts. Furthermore, the methodology and the results described in this study will contribute to the UAE national analysis of the impacts of dewatering on the water sector. However, field measurements of water table, groundwater qualities, soil salinity levels, geographic locations and elevations were used to verify the spatial analysis conducted. The temporal and spatial variations of the groundwater/soil quality, in the study area, were determined and visualized. Then the impacts of the dewatering were quantified and evaluated. It is found that dewatering has quantifiable impacts on the soil and ground water quality. The results show drastic but reversible changes in water salinity and light but persistent/ irreversible changes in soil salinity. The magnitude of the increase in the water salinity is in the range of 0.4 g/L - 1.8 g/L. While the magnitude of the change in the soil salinity is in the range of 0.02 – 0.04 g/L.

References

1. Sherif M, Sefelnasr A, Ebraheem AA, Al Mulla M, Alzaabi M, Alghafli K. (2021). Spatial and Temporal Changes of Groundwater Storage in the Quaternary Aquifer, UAE. Water. 13(6):864. https://doi.org/10.3390/w13060864
2. Alagaiya Veeramani. (2020). Groundwater Issues in Construction. Intertek publication, https://www.intertek.com/blog/2020/11-10-groundwater/
3. M. L. Angel, S. Johnston, K. O’Steen, C. Brown* and T. Sando. (2015). Groundwater Control Issues in Transportation Engineering: A Short Review of Dewatering Methods and Lessons Learned. Journal of Engineering Science and Technology Review 8 (3): 8-13.
4. Estanislao Pujades, Anna Jurado. (2021). Groundwater-related aspects during the development of deep excavations below the water table: A short review, Underground Space, 6 (1): 35-45. https://doi.org/10.1016/j.undsp.2019.10.002.
5. Rodriguez, J. (2016). “What is Dewatering?” Retrieved from The Balance: https://www.thebalance.com/
6. J. Patrick Powers. (1985). Dewatering: Avoiding Its Unwanted Side Effects. American Society of Civil Engineers (ASCE), pp 86.
7. Business Bliss Consultants FZE. ukessays.ae, (2018). "Developing Groundwater Sources in the UAE.". https://www.ukessays.ae/essays/biology/developing-groundwater-sources-uae-3714?vref=1>.
8. Michel Mailloux, Vincent Boisvert, Denis Millette, Eng., (2009). “Potential effects evaluation of dewatering an underground mine on surface. Retrieved from Golder Associates Ltd., Montreal, Canada: http://www.dhigroup.com/
9. Hauck, E. (n.d.). “GIS Mapping”. Retrieved from RMB Environmental Laboratories, Inc.: http://rmbel.info/consulting/gis-mapping/
10. Groundwater Engineering Limited. (2014). “Managing Impacts of Dewatering” Retrieved from GROUNDWATER ENGINEERING: http://www.groundwatereng.com/blog/2014/02/managing-environmental-impacts-of-dewatering
11. Ye, X. & Ran, L. & Yi, T. & Dong, X. (2012). Intelligent Risk Assessment for Dewatering of Metro-Tunnel Deep Excavations. Mathematical Problems in Engineering. 2012. 10.1155/2012/618979.
12. Area Overview: Dubai Silicon Oasis, Retrieved from dubizzle: https://www.dubizzle.com/blog/property/dubai-silicon-oasis/
13. Connelly, R., & Prado, M. (2007). “A GIS Based Groundwater Management Tool for Long Term”.
14. Newton, B. (2010). “Construction of Water Table Maps Using GIS”. Retrieved from http://serc.carleton.edu/: http://serc.carleton.edu/NAGTWorkshops/gis/activities2/48389.html
15. Spanou, C. L. (2013). “Mining geohazards—land subsidence causes”. Springer Science, 18.
16. Woldai, T., & Taranik, J. (2008). Environmental Impact Assessment of Mining Related Dewatering” International Institute for Geo-Information Science and Earth Observation (ITC), 8.
17. NRC, 2011. Saltwater Intrusion and Climate Change: A primer for local and provincial decision-makers. Natural Resources Canada (NRC). Accessed 5 December 2022.