The population dynamics of the capitellid polychaete Capitella aff. teleta were studied in Gamo Lagoon, located northeast Japan, for subsequent 2 years from 2016, when a series restoration works was conducted following 2011 Great East Japan Earthquake and tsunami. found to be widely distributed estuary side, where levee located, innermost part but more abundant part, which is rich organic matte...

Although hydraulic infrastructure such as levees remain important for flood risk management in the USA, France, and Quebec (Canada), there is increasing emphasis on nonstructural measures, regulatory maps, to reduce exposure vulnerability, example, preventing people from building high hazard areas. One key concept related areas protected by that of “residual risk”, is, floods greater than desig...

The overall intent of this research is to develop numerical models of erosion of levees, dams and embankments, validated by physical models. The physical model tests were performed at 1-g and at high g’s using a geotechnical centrifuge facility. The erosion was modeled in detail, from beginning to end, that is from the time the levee was overtopped until the levee was breached. Typical quantiti...

To re-establish the intertidal wetlands with full tidal exchange and improve salmonid rearing habitat in the Skagit River estuary, State of Washington, USA, a diked agriculture farm land along the Skagit Bay front is proposed to be restored to a fully functional tidal wetland. The complex and dynamic Skagit River estuarine system calls for the need of a multi-facet and multi-dimensional analysi...

Numerical limit analyses have been used to evaluate the stability of the 17th Street Canal I-wall levee during Hurricane Katrina. The potential formation of a water-filled gap along the canal-side soil-wall interface at failure is included in both the lowerand upper-bound formulations. The analyses replicate published two-dimensional (2D) cross sections and soil properties developed in forensic...

The woody communities of seven of the most intact bottomland hardwood forests of southeastern Louisiana are described. The seven forests are on old levee ridges associated with past distributaries of the Mississippi River. The communities were divided by diameter size class into overstory (~10.0 cm dbh) and understory (3.0 cm 2 10.0 cm dbh). The overstory (27 species) and understory (24 species...