{"id":15996,"date":"2020-08-12T09:56:13","date_gmt":"2020-08-12T01:56:13","guid":{"rendered":"https:\/\/www.oc.ntu.edu.tw\/oceng\/?p=15996"},"modified":"2023-08-02T05:02:01","modified_gmt":"2023-08-01T21:02:01","slug":"temporal-variations-of-submarine-groundwater-discharge-into-a-tide-dominated-coastal-wetland-gaomei-wetland-western-taiwan-indicated-by-radon-and-radium-isotopes","status":"publish","type":"post","link":"https:\/\/www.oc.ntu.edu.tw\/en\/research-highlights\/15996\/","title":{"rendered":"Temporal variations of submarine groundwater discharge into a tide-dominated coastal wetland (Gaomei Wetland, Western Taiwan) indicated by radon and radium Isotopes"},"content":{"rendered":"<p><!--:en-->Although not as obvious as surface runoffs, groundwater flowing across the seabed into the ocean, so-called Submarine Groundwater Discharge (SGD), indeed occurs in many coastal areas. SGD, comprising of terrestrial fresh groundwater flowing from the aquifers and seawater infiltrating through the permeable sediments, is regarded as a significant process of hydrological cycle and play an important role for materials exchange between land and sea. The chemical composition of SGD usually differs from that predicted, even reveals much higher concentrations of nutrients due to the biogeochemical reactions within the coastal aquifer; subsequently the quality of seawater might be modified when entering the coastal region and then have a profound impact on coastal ecosystems. Therefore, study of SGD is essential for evaluating the potential discharges of nutrients and other associated solutes.<\/p>\n<p>In Taiwan, although land subsidence and seawater intrusion caused by groundwater overexploitation often occur in coastal areas, the existence of groundwater flowing across the seabed has been proved. But the seasonal\/temporal changes of SGD have not been fully examined. Here, we reported a time-series investigation of SGD into a tide-dominated coastal wetland, the Gaomei Wetland, located at the south of Da-Chia River\u2019s mouth, via using naturally occurring radionuclides as tracers. Our results showed that regardless of dry and wet seasons, the <sup>222<\/sup>Rn activities in coastal waters were high at low tide but low at high tide. It represents the continuous input of <sup>222<\/sup>Rn-enriched groundwater. However, the <sup>224<\/sup>Ra<sub>ex<\/sub> and <sup>228<\/sup>Ra activities showed seasonal changes with tide conditions. At dry season, the <sup>224<\/sup>Ra<sub>ex<\/sub> and <sup>228<\/sup>Ra activities in coastal waters were low at low tide but high at high tide; whereas at wet season, an opposite relation was observed with quite high <sup>224<\/sup>Ra<sub>ex<\/sub> and <sup>228<\/sup>Ra activities in low-tide waters. It suggested that these phenomena probably reflected a seasonal difference in main SGD component with fresh SGD at dry season but saline one at wet season. Based on a <sup>222<\/sup>Rn mass balance model (Figure 1), the estimated SGD fluxes into the Gaomei Wetland varied with tidal fluctuations and ranged from 0.2 to 25 cm d<sup>-1<\/sup> and from 0.1 to 47 cm d<sup>-1<\/sup> for dry and wet seasons, respectively. In this study, we demonstrated the variation of SGD into the Gaomei Wetland is not only controlled by the seasonal changes of groundwater recharge, but also by the tidal pumping process.<br \/>\n<a href=\"https:\/\/www.oc.ntu.edu.tw\/wp-content\/uploads\/2020\/08\/image0011.png\"><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-20905\" title=\"image001\" src=\"https:\/\/www.oc.ntu.edu.tw\/wp-content\/uploads\/2020\/08\/image0011.png\" alt=\"\" width=\"1390\" height=\"663\" \/><\/a><\/p>\n<p style=\"text-align: left;\" align=\"center\">Figure 1: A synoptic diagram of the <sup>222<\/sup>Rn mass balance model in the Gaomei Wetland.<\/p>\n<p>&nbsp;<\/p>\n<p>Hsu, F.H., Su, C.C.*, Wang, P.L., Lin, I.T. (2020) Temporal Variations of Submarine Groundwater Discharge into a Tide-Dominated Coastal Wetland (Gaomei Wetland, Western Taiwan) Indicated by Radon and Radium Isotopes. Water, 12(6), 1806.<\/p>\n<p>&nbsp;<!--:--><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Although not as obvious as surface runoffs, groundwater flowing across the seabed into the ocean, so-called Submarine Groundwater Discharge (SGD), indeed occurs in many coastal areas. SGD, comprising of terrestrial fresh groundwater flowing from the aquifers and seawater infiltrating through the permeable sediments, is regarded as a significant process of hydrological cycle and play an [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[119],"tags":[142],"class_list":["post-15996","post","type-post","status-publish","format-standard","hentry","category-research-highlights","tag-research-highlights-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Temporal variations of submarine groundwater discharge into a tide-dominated coastal wetland (Gaomei Wetland, Western Taiwan) indicated by radon and radium Isotopes - Institute of Oceanography, NTU<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.oc.ntu.edu.tw\/en\/research-highlights\/15996\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Temporal variations of submarine groundwater discharge into a tide-dominated coastal wetland (Gaomei Wetland, Western Taiwan) indicated by radon and radium Isotopes - Institute of Oceanography, NTU\" \/>\n<meta property=\"og:description\" content=\"Although not as obvious as surface runoffs, groundwater flowing across the seabed into the ocean, so-called Submarine Groundwater Discharge (SGD), indeed occurs in many coastal areas. SGD, comprising of terrestrial fresh groundwater flowing from the aquifers and seawater infiltrating through the permeable sediments, is regarded as a significant process of hydrological cycle and play an [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.oc.ntu.edu.tw\/en\/research-highlights\/15996\/\" \/>\n<meta property=\"og:site_name\" content=\"Institute of Oceanography, NTU\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/IONTUTW\" \/>\n<meta property=\"article:published_time\" content=\"2020-08-12T01:56:13+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-08-01T21:02:01+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.oc.ntu.edu.tw\/wp-content\/uploads\/2020\/08\/image0011.png\" \/>\n<meta name=\"author\" content=\"ocadmin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" 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