Sediment Transports and Qualities of Sediment in Rivers Flowing into Tokyo Bay

Abstract

To clarify sediment transport and qualities of sediment in rivers flowing into Tokyo Bay, we performed field measurements and numerical simulation for suspended-and bed-load transports and sediment qualities in the influent rivers. Particle size and ignition loss (IL) of sediment in several influent rivers were found to be similar to those in coastal area. Bed-load transport of coarse and fine sands, which are found in sediments of tidal flat, were larger than the corresponding suspended-load transport, indicating the importance of the bed-load transport for the sediment supply to tidal flat. It is also found that one third of the total sediment yield in the whole basin of Tokyo Bay was trapped in dams located in the basin.

Monitoring harmful microalgal species and their appearance in Tokyo Bay, Japan, using metabarcoding

“…The area of the Bay is 1500 km 2 (Hattori 1982) with an average depth of 45 m (Kokubu et al 2013). In total, 36 rivers flow to the bay (Nihei et al 2009) with higher discharges between June to September (Kokubu et al 2013). Dominant seasonal winds are from the northeast during winter and from the southwest during summer (Oda and Kanda 2009).…”