tailieunhanh - COASTAL AQUIFER MANAGEMENT: monitoring, modeling, and case studies - Chapter 6

Động lực thủy triều của dòng nước ngầm và Giao thông vận tải gây ô nhiễm trong tầng nước ngầm ven biển Ven Biển / cửa sông nước ô nhiễm đang trở thành một vấn đề ngày càng nghiêm trọng toàn cầu chủ yếu là do đầu vào của các chất gây ô nhiễm có nguồn gốc từ đất. Ví dụ, nước rò rỉ chất dinh dưỡng từ các khu vực sản xuất đường mía Đông Bắc Queensland đang gây ra mối quan tâm lớn đối với Great Barrier Reef ở Úc [Haynes và Michael-Wagner, 2000]. Suy thoái các nguồn tài. | CHAPTER 6 Tidal Dynamics of Groundwater Flow and Contaminant Transport in Coastal Aquifers L. Li . Barry . Jeng H. Prommer 1. INTRODUCTION Coastal estuarine water pollution is becoming an increasingly serious global problem largely due to input of land-derived contaminants. For example nutrient leachate from the sugar cane production areas of NorthEast Queensland is causing great concern for the Great Barrier Reef in Australia Haynes and Michael-Wagner 2000 . The resulting degradation of coastal resources affects significantly economic and social developments of coastal regions. Traditionally terrestrial fluxes of chemicals to coastal water have been estimated on the basis of river flow alone. However recent field observations indicate that contaminants entering coastal seas and estuaries with groundwater discharge submarine groundwater discharge SGWD can significantly contribute to coastal pollution especially in areas where serious groundwater contamination has occurred . Moore 1996 Burnett et al. 2001 . The International Geosphere-Biosphere Programme IGBP Buddemeier 1996 has identified submarine groundwater discharge as an important but rather unknown source of contamination for coastal marine and estuarine environments. As the groundwater contamination problem worsens the SGWD may become a dominant source of coastal pollution in certain areas. SGWD consists of both groundwater flow from upland regions and water exchange at the aquifer-ocean interface Simmons 1992 . While the upland groundwater flow can be estimated based on the aquifer recharge Zekster and Loaiciga 1993 it is difficult to quantify the rate of water exchange across the seabed which is influenced by near-shore processes Li et al. 1997a Turner et al. 1997 Li and Barry 2000 . Large rates of SGWD derived from geochemical signals of enriched natural tracers . 226Ra Moore 1996 in coastal seas have been found excessive and cannot 2004 by CRC Press LLC Figure 1 A simple model of SGWD .