Author(s): Katsuaki Komai; Junko Kato; Kazuki Kokubo; Shinya Nakashita; Tadashi Hibino; Keisuke Nakayama
Linked Author(s): Katsuaki Komai
Keywords: Sediment pore water; Salinity; Seepage flow; Stream velocity; Estuary
Abstract: Groundwater circulation in coastal zone is an important process for material transport. In this paper, the influence of water interaction across the sediment-water interface on pore water quality in fluvial sediment was investigated by field observations in a branch area of tidal estuary. A stream flow is divided into two stream flows through two water gates. The tidal variation of stream flow and material transport depend on the water slope in the downstream and transverse directions. Seepage meter can detect stream water infiltration and sediment pore water up-welling. The up-welling of pore water from the sediment was prominent in spring tide, and pore water quality is changed by the density difference between stream water and pore water. Pore water quality is also influenced by stream flow velocity according to the estimated diffusion coefficient.
Year: 2012