GROUNDWATER FLOW AND TRANSPORTATION OF SUSPENDED SUBSTANCE IN GRANULATED COAL ASH LAYER

Abstract

 Increase of sludge sedimentation caused muddy condition of tidal flat in the Ota River estuary. To improve the sediment condition and make a habitat for short-necked clam, granulated coal ash (GCA) layer was built as permeable layer in tidal flat in 2011. In this study, groundwater flow and groundwater quality in GCA layer were measured to understand the groundwater flow after 2 years from GCA layer construction. Groundwater fluidity was investigated from continuous measurement of groundwater level in GCA layer.
 Groundwater fluidity in GCA layer was kept high after 2 years from GCA layer construction. Moreover, it was understood that chlorophyll-a, oxygen, and suspended substance were transported due to the groundwater flow.