[A-HW32] Material transportation and cycling in aquatic ecosystems; from headwaters to coastal areas

convener:Syuhei Ban(The University of Shiga Prefecture), Adina Paytan(University of California Santa Cruz), Takahiro Hosono(Faculty of Advanced Science and Technology, Kumamoto University), Morihiro Maeda(Okayama University)

This session aims to synthetize watershed sciences in order to understand dynamic processes in transportation and cycling of materials and nutrients in aquatic environments from headwaters to coastal areas. The session will integrate various inter-disciplinary researches including limnology, ground water hydrology, coastal oceanography, meteorology, pedology, sedimentology, forestry, agriculture, fishery, ecology, social science and so on. This session calls for ideas on new methods for understanding the watershed sciences, such as tracer and molecular techniques, hydrological modeling, paleontological approaches, and chemical analyses, in order to elucidate physical, chemical and biological mechanisms for shedding light on natural phenomena and their spatio-temporal variations in complex and dynamic aquatic systems under human and climate impacts. Both laboratory and field studies, social-scientific evaluation of ecosystem services and social-ecological systems will be also welcomed. Through this session, we would like to facilitate interdisciplinary collaboration among participants to create new knowledge on watershed sciences.

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[AHW32-12] Coffee-waste biochar and nano-biochar applications to reduce nitrous oxide and carbon dioxide emissions from agricultural soils

*Morihiro Maeda¹, Thuong Thi Thu Nguyen¹, Chiyu Nakano¹, Yuta Nishina¹ (1.Okayama University)

[AHW32-13] Suppression of phosphorous release from sediment in agricultural drainages flowing into Lake Kojima by using biochar-amended sediment microbial fuel cells

*Gamamada Liyanage Erandi Priyangika Perera¹, Morihiro Maeda¹ (1.Graduate School of Environmental and Life Science, Okayama University)

[AHW32-14] Assessment of hydrological processes and sediment yield in Dakbla catchment, Kon Tum province, Vietnam.

*Tram Ngoc Quynh Vo¹, Hiroaki Somura¹ (1.Okayama University)

[AHW32-15] Acidic fresh submarine groundwater discharge around mud diapirs in southwestern Taiwan

*Hon-Kit Lui¹, Chen-Tung Arthur Chen¹, Wei-Ping Hou², Rae Chang¹ (1.Department of Oceanography, National Sun Yat-sen University, Kaohsiung 80424, Taiwan, 2.Taiwan Ocean Research Institute, National Applied Research Laboratories, Kaohsiung 80143,Taiwan. )

[AHW32-16] Spatio-temporal dynamics of submarine groundwater discharge (SGD) on an intertidal beach scale, temperate coastal area

*Mitsuyo Saito¹, Shin-ichi Onodera², Shingo Nozaki², Yusuke Tomozawa² (1.Okayama University, 2.Hiroshima University)

[AHW32-17] Impact of terrestrial nutrients in groundwater on coral reefs via submarine groundwater discharge around Yoron Island of the Southwest Islands, Japan

*Shinji Nakaya¹, Sho Nagata¹, Masashi Toyota¹, Jun Yasumoto², Tetsuya Shintani³, Takashi Nakamura⁴ (1.Department of Water Environment and Civil Engineering, Faculty of Engineering, Shinshu University, 2.Department of Regional Agriculture Engineering, University of the Rykuyus, Japan, 3.Department of Civil and Environmental Engineering, Tokyo Metropolitan University, 4.Biology Program, Faculty of Science, University of the Ryukyus)