| A preliminary study is conducted by means of satellite image analysis, field survey and numerical computation to understand bank erosion of Sittaung River estuary in Myanmar. Sittaung River estuary exhibits a trumpet shape and therefore, strong tidal currents following a bore front take place in the periods of a full moon as well as a new moon. Bank erosion is caused severely owing to such strong currents directed towards the inland, and the bank line retreats at amount of 10 km in most active area these ten years. Present paper discusses a relationship between bed and bank material collected in the river reach and the estuary, potential mechanism of bank erosion and numerical results on tidal currents. Results obtained from discussions suggest that bed sediment, which is composed of clay and silt particles, is supplied owing to bank erosions of the estuary and river reach as well as from far upstream as wash-load, and suggest that tidal currents are reproduced fairly well numerically based on a depth integrated two dimensional flow model. |
