IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 35th IAHR Congress - Chengdu (2013) : THEME 6 - MARITIME HYDRAULICS AND COASTAL ENGINEERING : In-site Measurement for Relationship among Grain Size Distribution of Suspended Solid and Bottom Sed...
In-site Measurement for Relationship among Grain Size Distribution of Suspended Solid and Bottom Sediment and Particulate Total Mercury in Minamata Bay, Japan
Author : Shinichiro Yano, Akihiro Hisano, Herawaty Riogilang, Hayato Kawase, Akira Tai, Akito Matsuyama, Akihide Tada, Kohei Yano and Wei Huang
Mercury in sea water can be transported by advection and diffusion\dispersion processes, and there are exchange processes between air and sea water and one between bottom sediment and sea water. Both of methylmercury and inorganic mercury can exist as both of particulate form and dissolved one in water. Since particulate mercury may attach with suspended solids (SS) in water, the distribution can depend on resuspention and settling of bottom sediments. Thus, in the recent development of numerical model for mercury transport and its fate combination of hydrodynamic model, which can solve the physical oceanographic process such as a flow and a sediment transport, with biogeochemical model to solve methylation-demethylation equilibrium for mercury has been studying. Since 2006, our research group has been conducting monthly monitoring of mercury concentration in sea water in the Minamata Bay, Japan. In 2010 we introduced LISST-100X which can measure in-situ grain size distribution of SS into monthly water sampling. In the present paper, we report these measurement results. In addition, core sampling for bottom sediment was conducted three times in 2010, 2011 and 2012. As a result, the followings were clarified: i) There is significant difference of SS grain size distribution between upper layer and lower one in density stratification; ii) Origin of SS in upper layer can be estimated to exist in except for bottom sediment and load from rivers; and iii) Characteristics of correlation between particulate T-Hg and SS grain size distribution are obvious.
File Size : 938,175 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 35th IAHR Congress - Chengdu (2013)
Date Published : 19/07/2016
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