Bank erosion of rivers, e.g. Bagmati, Burhi Gandak, Kosi and Kamla-Balan, all originating in the Himalayan hills of Nepal and flowing throughthe alluvial plains of North Bihar, is a chronic and common phenomenon.Cutti...Bank erosion of rivers, e.g. Bagmati, Burhi Gandak, Kosi and Kamla-Balan, all originating in the Himalayan hills of Nepal and flowing throughthe alluvial plains of North Bihar, is a chronic and common phenomenon.Cutting and deposition result in shifting or meandering of the riverendangering the embankment, road, bridge, barrage, and countryside.Anti-erosion and maintenance require huge investment. The river Kamla-Balan faces bank erosion throughout its embanked length, but stretchesat km 37 and 62 are highly unstable and vulnerable. This paper dealswith the problem, presents the hydrological details responsible for thehazard, and demonstrates the effectiveness of supplementary geo-textilewith conventional sand filter pitching to protect the soil and slope of theriverbank. Estimated flood discharge and velocity at 100 years of returnperiod is nearly 2100 cumecs and 0.9 m/sec, respectively. Riverbed andbank material is represented by silt with d50 of 0.018 to 0.05 mm while0.02 mm of silt may get eroded and transported by flow above 0.15 m/s. Launching apron is also required due to local scour. Model study testshows its suitability under various hydraulic conditions. Study reveals theeffectiveness of woven type geo-textile reinforced revetment irrespective ofcost and environmental consideration.展开更多
文摘Bank erosion of rivers, e.g. Bagmati, Burhi Gandak, Kosi and Kamla-Balan, all originating in the Himalayan hills of Nepal and flowing throughthe alluvial plains of North Bihar, is a chronic and common phenomenon.Cutting and deposition result in shifting or meandering of the riverendangering the embankment, road, bridge, barrage, and countryside.Anti-erosion and maintenance require huge investment. The river Kamla-Balan faces bank erosion throughout its embanked length, but stretchesat km 37 and 62 are highly unstable and vulnerable. This paper dealswith the problem, presents the hydrological details responsible for thehazard, and demonstrates the effectiveness of supplementary geo-textilewith conventional sand filter pitching to protect the soil and slope of theriverbank. Estimated flood discharge and velocity at 100 years of returnperiod is nearly 2100 cumecs and 0.9 m/sec, respectively. Riverbed andbank material is represented by silt with d50 of 0.018 to 0.05 mm while0.02 mm of silt may get eroded and transported by flow above 0.15 m/s. Launching apron is also required due to local scour. Model study testshows its suitability under various hydraulic conditions. Study reveals theeffectiveness of woven type geo-textile reinforced revetment irrespective ofcost and environmental consideration.
