OPTIMUM CONDITIONS OF OYSTER SHELLS AS MATERIAL COVERING SEDIMENT AND INHABITATION SIMULATION OF INTERNAL LOAD USING ECOSYSTEM MODEL
Keywords:Oyster shell, Shell-covering effect, Internal load, Ecosystem model, Simulation
A remediation program for a canal with water quality problem will be carried out in the future,
and internal load from the bottom sediment can be new problem. Remediation measure against internal load was
investigated by using oyster shells as covering material. So that shell-covered sediment experiments and
numerical experiments were carried out. Pre-treatment such as graining and heating might be in vain, and nonheated shells of chip or powder size will be optimum. Properties of nutrient elusion were also obtained at the
experiments. Numerical experiment was investigated on reducing patterns against external load and internal load
to evaluate the various remediation measures by using ecosystem model added shell-covered sediment model.
Only shell covering might have the small effect of water quality improvement. Good water quality is expected to
be archived in the long period by a combination of reducing external load and applying bioresources.