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Seawater intrusion impacts on groundwater and soil quality in the northern part of the Nile Delta, Egypt

机译：海水入侵影响尼罗河三角洲北部地下水和土壤质量

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摘要

Seawater intrusion (SI) is thought to be a significant threat to groundwater and soil quality in arid costal ecosystems, causing a reduction in freshwater availability and soil productivity. This study investigated the effects of seawater intrusion on soil and groundwater quality in the Nile Delta region at 16 sites located at distances of 5-45 km from the coast. We found that groundwater and soil quality were significantly affected by seawater intrusion. Results from the investigations indicated that: (1) the salinity and alkalinity of groundwater and soil pore-water decreased with increasing distances towards the inland, and showed significant positive correlations for EC, SAR, Na(+)and Cl(-)by 0.80, 0.46, 0.78 and 0.66 respectively offshore (45 km); (2) there were significant positive correlations between salinity and alkalinity of both groundwater and soil pore-water inland up to 15 km distance from the coast;(3) mixing ratio values (F%) of seawater and groundwater were 9.30 to 37.56% in different sites, recording a maximum value close to the sea (5 km), while a minimum value was observed offshore (45 km); and (4) increasing seawater intrusion had negative impacts on the quality of groundwater and soil up to 15 km from the sea, providing the possibility of exploiting irrigated land in Nile delta up to 15 km from the Mediterranean sea.
机译：海水入侵（SI）被认为是对干旱肋骨生态系统的地下水和土壤质量的重大威胁，导致淡水可用性和土壤生产率降低。本研究调查了海水侵扰海水侵入在距离海岸5-45公里的距离的尼罗三角洲地区的土壤和地下水质量的影响。我们发现地下水和土壤质量受海水侵扰的显着影响。调查结果表明：（1）地下水和土壤孔隙水的盐度和碱度随着内陆的距离增加而降低，对EC，SAR，NA（+）和CL（ - ）显示出显着的阳性相关性0.80分别离岸0.46,0.78和0.66（45公里）; （2）地下水和土壤孔隙水的盐度和碱度之间存在显着的正相关性，距离海岸有15公里;（3）海水和地下水的混合比例（F％）为9.30至37.56％不同的网站，靠近海（5公里）的最大值，距离海上最小值（45公里）; （4）海水入侵增加对海域地下水和土壤质量的负面影响，距离海域有15公里，提供距离地中海的尼罗三角洲灌溉土地的可能性。

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