Sources and spatial variability of groundwater-delivered nutrients in Maunalua Bay, Oʻahu, Hawai‘i
Sources and spatial variability of groundwater-delivered nutrients in Maunalua Bay, Oʻahu, Hawai‘i
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夏威夷欧胡岛毛纳鲁亚湾地下水输送养分的来源和空间变异
DOI：
10.1016/j.ejrh.2015.11.006
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Robert Whittier
中科院分区：
文献类型：
--
作者：
C. Richardson;H. Dulai;Robert Whittier
研究区域Maunalua湾，夏威夷州，研究重点我们研究了海底地下水排放（SGD），陆地地下水，并在两个相邻的含水层（Waialae东和Waialae西）的近岸海水水质不同的土地利用和水文地质特征，以更好地了解SGD输送营养物质的来源和空间变异。测量了营养盐浓度和NO3-稳定同位素比率，并将其与SGD通量、土地利用和补给数据相结合，以检查每个含水层中的SGD营养负荷和潜在来源。（166-171 μM）和δ 15 N-NO3 −值（10.4-10.9‰）在Waialae West含水层的SGD中很明显，这是一个现场处理系统密度较高的区域（例如，游泳池）。在邻近的Waialae East含水层的沿海采样点，这些参数的值明显较低，δ 15 N-NO3 −值范围为5.7-5.9‰，NO3−浓度范围为43-69 μM。来自Waialae West含水层的SGD中NO3−的同位素组成与废水一致。模拟补给数据证实了NO3−稳定同位素来源的指定。从Waialae西部含水层产生的SGD主要受废水源与低营养地下水的双组分混合的影响，因为废水流出物占含水层总补给量的4%以上，占总氮和磷负荷的54-95%。
Study regionMaunalua Bay, Oʻahu, Hawai’i.Study focusWe examined submarine groundwater discharge (SGD), terrestrial groundwater, and nearshore marine water quality in two adjacent aquifers (Waialae East and Waialae West) with differing land-use and hydrogeologic characteristics to better understand the sources and spatial variability of SGD-conveyed nutrients. Nutrient concentrations and NO3−stable isotope ratios were measured and integrated with SGD flux, land-use, and recharge data to examine SGD nutrient loads and potential sources in each aquifer.New hydrological insights for the regionRegionally elevated NO3- concentrations (166–171 μM) and δ15N–NO3−values (10.4–10.9‰) were apparent in SGD in the Waialae West Aquifer, an area with high on-site disposal system density (e.g., cesspools). Coastal sites sampled in the neighboring Waialae East Aquifer exhibited significantly lower values for these parameters, with δ15N–NO3−values ranging from 5.7–5.9‰ and NO3−concentrations from 43–69 μM. The isotopic composition of NO3−in SGD originating from the Waialae West Aquifer was consistent with wastewater. Modeled recharge data corroborated the NO3−stable isotope source designation. SGD emanating from Waialae West Aquifer was primarily influenced by two-component mixing of a wastewater source with low nutrient groundwater as wastewater effluent accounted for more than 4% of total recharge and 54–95% of total N and P loads in the aquifer.
影响因子：
7.4
作者：
Sigman, DM;Casciotti, KL;Böhlke, JK
通讯作者：
Böhlke, JK
影响因子：
7.4
作者：
Casciotti, KL;Sigman, DM;Hilkert, A
通讯作者：
Hilkert, A