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Nutrient Loading in the Indian River Lagoon from Groundwater at the River Walk Transect

机译：在印度河泻湖的营养装载从地下水在河边走路横断面

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The Indian River Lagoon (IRL) is located on the east coast of Florida and is protected from the Atlantic Ocean by coastal islands known as the "barrier-island chain". The IRL is an estuary that is approximately 250 km long and stretches from Volusia County in the north to Palm Beach County in the south. Its width varies of 0.8 km to 8 km. The IRL watershed has been modified by urban and agricultural development. The main concern is that the IRL system is becoming more eutrophic, particularly in the northern reaches where major algae blooms of long duration (months) are becoming more frequent. A study was conducted to determine the groundwater seepage and the associated nutrient (dissolved nitrogen and phosphorus) loads transported into the lagoon via groundwater at River Walk, Florida, from June 2014 to September 2015. The width of the lagoon at River Walk is approximately 1.56 km. The nutrient loads were determined using the finite difference model SEAWAT which was calibrated by comparing model predicted hydraulic heads with measured hydraulic heads. During the fifteen-month period from June 2014 to September 2015, the groundwater seepages, per unit length of shoreline, ranged between 0.67 m~3/day and 0.85 m~3/day. The total nitrogen loads, per linear meter of shoreline, ranged from 562 mg/day to 1866 mg/day or 205.1 kg/year per km of shoreline to 681 kg/year per km of shoreline whereas, the total phosphorus loads ranged from 177 mg/day to 248.3 mg/day per meter of shoreline or 64.6 to 90.6 kg/year per km of shoreline. The assessed TN and TP loads due to groundwater showed a high level of temporal and spatial variation, and can be a significant contributor to the eutrophication within the IRL.
机译：印度河泻湖（IRL）位于佛罗里达州东海岸，受到沿海岛屿的保护，被称为“屏障岛链”。 IRL是一个大约250公里长的河口，从北北兰西亚县延伸到南部的棕榈海滩县。它的宽度为0.8公里到8公里。 IRL流域已被城市和农业发展修改。主要问题是，IRL系统变得越来越富养殖，特别是在北部到达，主要藻类长期（月）的主要藻类变得更加频繁。进行了一项研究以确定地下水渗流和相关的营养素（溶解的氮气和磷）通过地下水在2014年6月至2015年6月至9月的河流步行中运输到泻湖中。河道泻湖的宽度约为1.56 km。使用通过将模型预测的液压头与测量的液压头进行比较来校准的有限差分模型海南测定营养载荷。在2014年6月至2015年6月的十五个月期间，地下水渗透，每单位海岸线的长度，范围在0.67米〜3 /天之间，0.85米〜3天。总氮负载，每个线性米海岸线，范围从562毫克/天到1866毫克/天或205.1公斤/年海岸线的每公里到681公斤/年的海岸线，而总磷载荷从177毫克/天每米海岸线248.3毫克/天或64.6至90.6千克/年/千克海岸线。由于地下水引起的评估的TN和TP载荷显示出高水平的时间和空间变化，并且可以是IRL内富营养化的重要因素。

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