基于近岸系列分层竖井的海底地下水排泄及其营养盐输入研究
Submarine Groundwater Discharge and Dependent Nutrient Input Based on a Series of Layered Monitoring Wells
投稿时间:2020-08-05  
DOI:10.11908/j.issn.0253-374x.20313     稿件编号:    中图分类号:P76
 
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中文摘要
      以广西北海市近岸系列分层竖井为研究对象,通过现场地下水监测和采样分析,结果显示竖井含水层整体上为靠近海边咸化明显,其中I承压水咸化程度较大,咸化程度差异主要受海水入侵及海水高位养殖影响。地下水SiO3-Si由于受“盐效应”影响导致其自内陆向海岸浓度升高,而低含量的PO4-P含量可能是铁氧化物的吸附清除作用引起的;潜水层中的NH4-N和NOx-N含量整体高于承压水的,高位养殖池塘水的下渗造成NH4-N在近海岸的潜水层含量最高,而NOx-N受反硝化过程影响,导致自内陆至海岸明显减小。研究区地下水氮磷比(N/P)平均值为595.85,高N/P比值地下水排泄进入海洋,将促进浮游生物营养盐结构由N限制转向P限制。
英文摘要
      The submarine groundwater of a series of stratified vertical wells near the coast of Beihai, Guangxi was monitored and analyzed on-site. The monitoring and sampling analysis show that the salinity in the groundwater in Confined I which is close to the seaside is relatively high, and the difference in salinity is mainly affected by seawater intrusion and high-level mariculture. The concentration of SiO3-Si in groundwater increases from inland to coastal area due to the “salt effect”, and the low content of PO4-P which may have been caused by the adsorption and removal of iron oxides. The NH4-N and NOx-N concentrations in the phreatic layer are higher than those in confined water. The infiltration of high-level aquaculture pond water results in the highest NH4-N concentration in the nearshore phreatic layer, while NOx-N is affected by denitrification. The average N / P ratio of groundwater in the studied area is 595.85, and the discharge of groundwater with a high N / P ratio into the ocean will promote the transformation of nutrient structure of plankton from N limitation to P limitation.
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