Accession Number : ADA304066

Title :   Prediction of Mouth Bar Development and Deformation for Navigation Purposes.

Descriptive Note : Final technical rept. 1 Mar-30 Nov 95,

Corporate Author : PEOPLES FRIENDSHIP UNIV MOSCOW (RUSSIA) DEPT OF ENGINEERING

Personal Author(s) : Butakov, Alexander N.

PDF Url : ADA304066

Report Date : 29 JAN 1996

Pagination or Media Count : 20

Abstract : A new theoretical model for the development of an estuary bed profile under the influence of river flow is presented. The model is based on original dependences describing the distribution of the free-water surface slope both along and across the mouth reach that were developed by an analysis of experimental data. A fundamentally new solution is given, which accounts for the turbulent interactions between flow jets in the coastal area where the river flow actively interacts with the surrounding water. Two variants of the theoretical model were formulated, a one-dimensional and a two-dimensional model (a flow plan). Numerical solution of the one-dimensional model allowed prediction of bottom deformations with time under the influence of key hydrological factors at different slopes of coastal bottom relief Numerical solution of the flow plan model provided the longitudinal and transverse distributions of flow velocities and bottom relief deformations. An analysis of the obtained information afforded novel dependences describing the rates of bottom relief formation and bar crest growth, as well as the final height of the bar crest and the rate of its downstream migration. The results of calculations are in perfect agreement with the experimental data and field measurements. The results of this work will help choosing the right location and depth of navigable channels in estuaries.

Descriptors :   *HYDROLOGY, *NAVIGATION, VELOCITY, MATHEMATICAL MODELS, MEASUREMENT, POSITION(LOCATION), WATER FLOW, EXPERIMENTAL DATA, COASTAL REGIONS, COMPUTATIONS, SIZES(DIMENSIONS), PREDICTIONS, MODELS, DISTRIBUTION, INTERACTIONS, DEFORMATION, ONE DIMENSIONAL, THEORY, FIELD TESTS, NUMERICAL ANALYSIS, TURBULENCE, PROTOTYPES, DEPTH, SURFACES, SOLUTIONS(GENERAL), FLOW RATE, SLOPE, MIGRATION, RIVERS, MENTAL ABILITY, BOTTOM, HEIGHT, CHANNELS, MOUTH, TRANSVERSE, ESTUARIES.

Subject Categories : Hydrology, Limnology and Potamology
      Navigation and Guidance

Distribution Statement : APPROVED FOR PUBLIC RELEASE