A hydrograph-based prediction of meander migration

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Title: A hydrograph-based prediction of meander migration
Author: Wang, Wei
Abstract: Meander migration is a process in which water flow erodes soil on one bank and deposits it on the opposite bank creating a gradual shift of the bank line over time . For bridges crossing such a river , the soil foundation of the abutments may be eroded away before the designed lifetime is reached . For highways parallel to and close to such a river , the whole road may be eaten away . This problem is costing millions of dollars to TxDOT in protection of affected bridges and highway embankments . This research is aimed at developing a methodology which will predict the possible migration of a meander considering the design life of bridges crossing it and highways parallel to it . The approaches we use are experimental tests , numerical simulation , modeling of migration , risk analysis , and development of a computer program . Experimental tests can simulate river flow in a controlled environment . Influential parameters can be chosen , adjusted , and varied systematically to quantify their influence on the problem . The role of numerical simulation is to model the flow field and the stress field at the soil -water interface . Migration modeling is intended to integrate the results of experimental tests and numerical simulations and to develop a model which can make predictions . The Hyperbolic Model is used and its two major components Mmax equation and & #964 ;max equation are developed . Uncertainties in the parameters used for prediction make deterministic prediction less meaningful . Risk analysis is used to make the prediction based on a probabilistic approach . Hand calculation is too laborious to apply these procedures . Thus the development of a user friendly computer program is needed to automate the calculations . Experiments performed show that the Hyperbolic Model matches the test data well and is suitable for the prediction of meander migration . Based on analysis of shear stress data from numerical simulation , the & #964 ;max equation was derived for the Hyperbolic Model . Extensive work on the simplification of river geometry produced a working solution . The geometry of river channels can be automatically simplified into arcs and straight lines . Future hydrograph is critical to risk analysis . Tens of thousands of hydrographs bearing the same statistical characteristics as in history can be generated . The final product that can be directly used , the MEANDER program , consists of 11 ,600 lines of code in C++ and 2 ,500 lines of code in Matlab , not including the part of risk analysis . The computer program is ready for practice engineers to make predictions based on the findings of this research .
URI: http : / /hdl .handle .net /1969 .1 /3805
Date: 2006-08-16

Citation

A hydrograph-based prediction of meander migration. Available electronically from http : / /hdl .handle .net /1969 .1 /3805 .

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