Field Experiment on Sand Covering Using Dam-Deposited Sediment in the Tidal Flat at the Mouth of the Midorikawa River

Key Points

• This research aims to evaluate the impact of sand covering using sediment from Midorikawa Dam on the tidal flat's ground height and clam environment.
• Conducted a field experiment in the tidal flat at Midorikawa River.
• Utilized sediment deposited in Midorikawa Dam for the sand covering demonstration.
• Monitored changes in ground height and clam population density and growth over six months.
• Ground height remained stable during the six-month observation period.
• Significant increases in clam density and shell length were observed in the covered areas.
• Coarse materials in the sand covering contributed positively to habitat improvement and clam growth.