Observation method to predict meander migration and vertical degradation of rivers.

Details

• Creators:
  Briaud, Jean-Louis ; Montalvo-Bartolomei, Axel
• Corporate Creators:
  Texas A&M Transportation Institute
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Rivers
  • Meanders
  • Degradation (Hydrology)
  • Scour
  • Streambeds
  • Erosion control
  • Field studies
  • Hydrographs
  • Forecasting
• Publication/ Report Number:
  FHWA/TX-13/0-6724-2
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas
• Corporate Publisher:
  Texas. Dept. of Transportation. Research and Technology Implementation Office
• Abstract:
  Meander migration and vertical degradation of river bed are processes that have been studied for years. ; Different methods have been proposed to make predictions of the behavior of rivers with respect to these ; processes. These two erosion controlled processes consist of the gradual change of the geometry of the river ; due to the flow of water eroding the soil. This erosion may cause a shift that could be a threat to existing ; bridges, highways and useful lands. Therefore, there is need for a method that can accurately predict the ; amount of erosion that may occur in rivers. ; Six different sites in Texas were selected for this project. Four of the selected rivers have meander migration ; problems and two have vertical degradation problems. Each river has shown erosion problems that have been ; a threat to the bridges, roads or farm lands. Aerial photos and maps from different years were obtained from ; different sources to study the change of the geometry of the rivers. River hydrographs were obtained from ; the U.S. Geological Survey to estimate the river velocity. Soil samples from each site were obtained for ; laboratory testing, using the Erosion Function Apparatus. ; A method to predict meander migration and vertical degradation was developed by using the three main ; factors: geometry, water flow and soil erodibility. A code was written in MATLAB and Excel to predict the ; future movement of the meander or the vertical degradation by using a model based on the erosion function ; obtained from the erosion tests of the soil at each site and the average daily velocity of each river. Because ; this method is based on observed data, it was called the Observation Method.
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• Format:
  PDF
• Funding:
  Project 0-6724
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/27749/dot_27749_DS1.pdf
• File Type:
  [PDF - 3.71 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:6779e691334d294f34c253d3441e9161b815a5912a88a5d68cff4d5f4a149cb6