文献类型：期刊文献

英文题名：Evaluation of the spatial distribution of submarine groundwater discharge in a small island scale using the 222 Rn tracer method and comparative modeling

作者：Zhu A.[1,2];Saito M.[3];Onodera S.-I.[2];Shimizu Y.[4];Jin G.[2,5];Ohta T.[6,7];Chen J.[8]

机构：[1]School of Life Sciences, Sun Yat-sen University, Guangzhou, China;[2]Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashi, Hiroshima, Japan;[3]Graduate School of Environmental and life Science, Okayama University, Okayama, Japan;[4]Western Region Agricultural Research Center, National Agricultural and Food Research Organization, Fukuyama, Japan;[5]College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang, China;[6]Civil Engineering Research Laboratory, Central Research Institute of Electric Power Industry, Abiko, Japan;[7]Graduate School of Frontier Sciences, University of Tokyo, Kashiwa, Japan;[8]School of Geography and Planning, Sun Yat-sen University, Guangzhou, China

年份：2019

卷号：209

起止页码：25

外文期刊名：Marine Chemistry

收录：Scopus(收录号：2-s2.0-85058786171)

基金：This study was supported by funding from the JSPS KAKENHI Grant ( 25241028 ) and the National Natural Science Foundation of China ( 41611140112 ). The author is grateful to Tomozawa. Y and Morita. M for assistance with field sampling, and Dr. Mutsuo Inoue and Dr. Takumi Kubota for their support in radium analysis.

语种：英文

外文关键词：Island-scale; Radon ( 222 Rn); Submarine groundwater discharge (SGD); Topographic model

外文摘要：Submarine groundwater discharge (SGD) is an important source of freshwater, nutrients, and other chemicals to the coastal water, and has significant impacts and implications for the coastal environment and ecology. Here, we combined geochemical tracers and hydrologic modeling to investigate the spatial patterns and quantities of SGD and submarine fresh groundwater discharge (SFGD) at a small island of western Japan. The results reveal large spatial variability in SGD and SFGD, significant discharge in areas with steep topography, and much lower discharge from low-lying areas. Topographic influences are likely to be a major driver of spatial variability in SFGD. The 222 Rn mass balance model and two-end-member mixing model were used to estimate the SGD and SFGD rates. The values were ranged from 5.43 to 25.4 cm·d ?1 with an average value of 16.2 cm·d ?1 , and 0.39 to 1.98 cm·d ?1 with a mean value of 1.17 cm·d ?1 , for SGD and SFGD, respectively. The total flux of SFGD was calculated to be 8.49 × 10 6 m 3 ·yr ?1 , with 4.37 × 10 6 and 4.12 × 10 6 m 3 ·yr ?1 in the northern and southern regions of the island, respectively. The results were consistent with the values estimated by the topographic-based model. The ratio of the average annual SFGD to average annual precipitation (3.69 × 10 7 m 3 ) reached up to 23%, and the magnitude of annual SFGD was found to be similar to the total discharge from nine large rivers. Since the island faces a risk of water shortage, the results of the study can provide a useful insight into developing appropriate groundwater management strategies in this island's habitats. ? 2018 Elsevier B.V.