Determination of Location and Rate of Growth of Delta Formations
Author : Lloyd C. Fowler
Publisher :
Page : 52 pages
File Size : 13,55 MB
Release : 1957
Category : Deltas
ISBN :
Author : Lloyd C. Fowler
Publisher :
Page : 52 pages
File Size : 13,55 MB
Release : 1957
Category : Deltas
ISBN :
Author : Hansjörg Florian Seybold
Publisher :
Page : 115 pages
File Size : 21,19 MB
Release : 2009
Category :
ISBN : 9783952345436
Author : Hansjörg Seybold
Publisher : Sudwestdeutscher Verlag Fur Hochschulschriften AG
Page : 140 pages
File Size : 17,32 MB
Release : 2010-07
Category :
ISBN : 9783838114668
How do river deltas emerge and how do they evolve with time? These classical questions in geomorphology are computationally difficult to answer because of the long times and large ranges of length scales involved in the processes. Based on a simplified cellular model which captures the essential hydrodynamic features, it was possible to reproduce realistic river delta patterns and realistic delta dynamics. The modeling results have been compared with laboratory experiments and field data measurements.
Author : William H. McAnally
Publisher :
Page : 48 pages
File Size : 19,79 MB
Release : 1984
Category : Atchafalaya River (La.)
ISBN :
Author : John T. Wells
Publisher :
Page : 108 pages
File Size : 19,35 MB
Release : 1984
Category : Deltas
ISBN :
Author : Joseph V Letter (Jr)
Publisher :
Page : 119 pages
File Size : 32,18 MB
Release : 1982
Category :
ISBN :
This study predicts the future delta growth of the Lower Atchafalaya River delta based on an extrapolation of historical deposition trends in Atchafalaya Bay. The prediction is made with a regression model developed by correlating deposition rates with river discharge, sediment yield, local water depth, and location relative to the delta mass centroid. The regression model is applied to a 50-yr hydrograph using the 1977 bathymetry as initial condition. The predicted delta condition at 10-yr increments is reported. Sensitivity tests were made with the regression model which determined that the sequencing of hydrologic events had no impact on the resultant 50-yr condition, provided the total water and sediment entering the bay remained unchanged by re-sequencing events. It was concluded that within 50 yr the delta should evolve gulfward of Eugene Island, the gulfward limit of the bay.
Author : Jayaram Athreya Hariharan
Publisher :
Page : 0 pages
File Size : 29,62 MB
Release : 2022
Category :
ISBN :
Home to a disproportionate population relative to their areas, river deltas are critically important landscapes. Their locations at the interface of the land and sea make them particularly susceptible to sea level rise, while their vast extents limit characterization based on in situ observations alone. Consequently, remote sensing and numerical modeling methods and studies are needed to better understand the current processes occurring within these systems, as well as to estimate their future evolution. In this dissertation, a suite of remote sensing and numerical modeling methods are developed and applied to better understand current processes within deltas, and to project future changes. The first study is an assessment of the accuracy of discharge partitioning estimation from remotely sensed imagery of river delta networks. This analysis aggregates data from 15 site-specific studies to find that errors associated with graph-theoretic estimates of discharge partitioning are consistent across a diverse set of delta landscapes. In the second study, reduced-complexity modeling simulates the evolution and anthropogenic modification of idealized river deltas. Simulation of different hydrodynamic scenarios, and routing of passive particles through the landscape, enables characterizations of the impact that natural morphological differences, anthropogenic modifications, and different flow conditions have on material transport. The results suggest that material type exerts a first-order control over particle behavior, and human modifications to the landscape reduce hydrological connectivity. The third and fourth studies present reduced complexity modeling of deltaic evolution over hundreds of years to investigate the relationship between surface processes and subsurface form within deltaic environments in the context of their future evolution. In the third study, testing of different input sediment compositions and steady rates of sea level rise suggests that both variables influence surface morphology and subsurface connectivity. The fourth study considers the impact of sea level rise acceleration, and finds that the dynamic response of surface channels to an unsteady rate of sea level rise changes based on its magnitude and trajectory. These changes on the surface are mirrored to an extent in the subsurface, which can only be estimated from surface information if the sea level change is relatively steady for some period of time. The results of these studies provide guidance for both policy makers and managers of deltas, as it is clear that humans are significantly impacting the natural processes of these landscapes. Taken together, research conducted as part of this dissertation provides information about current processes and potential future evolution of delta landscapes
Author : A. Baker
Publisher :
Page : pages
File Size : 28,29 MB
Release : 2007
Category :
ISBN :
Author :
Publisher :
Page : 866 pages
File Size : 27,42 MB
Release : 1962
Category : Irrigation
ISBN :
Author :
Publisher :
Page : 248 pages
File Size : 19,39 MB
Release : 1962
Category : Hydrology
ISBN :