GEOMORPHIC CHANGES TO THE ONE HUNDRED TWO RIVER FLOODPLAIN NEAR MARYVILLE, MISSOURI AFTER THE MAY 2007 FLOOD

Anomalous spring storms delivered over 6 inches of precipitation to northwest Missouri from May 4 to 7, 2007 leading to one of the more significant flooding events across the area in more than a decade. The One Hundred Two River east of Maryville, Missouri crested at a stage height over 25.5 feet on May 7th, more than 7.5 feet over flood stage inundating adjacent floodplain and depositing numerous overbank deposits. Digital processing including temporal change detection and principal components analysis of aerial imagery obtained as part of the 2005 to 2007 National Agricultural Inventory Programs (USDA) was used to identify and map areas of potential sediment accumulation. Follow-up field investigations were conducted to verify deposit locations, map the lateral distribution of residual deposits using GPS and determine deposit thickness as a function of distance from channel bank. Results were compiled and will be presented indicating the short term geomorphic change on the floodplain adjacent to leveed and non-leveed sections of the One Hundred Two River in the greater Maryville area.