METHODOLOGY FOR PREDICTING CHANNEL MIGRATION

摘要: This report documents and presents the results of a study to develop practical methodology predict rate extent channel migration in proximity transportation facilities. The principal product this research was stand-alone Handbook for predicting stream meander using aerial photographs maps. is published separately as NCHRP Report 533. It deals specifically with problem incremental shift provides lateral shifting down valley meanders. comparison technique developed project consists overlaying banklines traced from successive historic maps or photos. Movement bankline position then evaluated by measuring change radius movement centroid best-fit circles on provide quantitative estimate distance, rate, direction over time. Predictions can be made potential river at some point future. process completed manually computer photo editing software. In addition, GIS-based approach ArcView extensions streamline measurement analysis bend data aid migration. are included CRP-CD-48, which comes also contains an archive base compiled CRP-CD-49 include all site acquired (141 sites containing 1,503 bends 89 rivers U.S.). will enable practicing engineers evaluate determine bridge other highway facility locations sizes ascertain need countermeasures considering impacts life crossing.