Thèse numérisée par la Direction des bibliothèques de l'Université de Montréal.

The object of this thesis is the synthetic generation of possible future flows in the James River at Buchanan, Virginia, through the utilization of existing records of monthly precipitation and runoff. Twelve separate monthly regression models were chosen on the basis of the degree of correlation as indicated by the correlation coefficient. Random monthly precipitation totals were generated from the twelve separate distributions of historical monthly precipitation totals. The synthetic precipitations were used in the twelve monthly models to generate 5000years of artificial record. The 5000-year synthetic record was divided into fifty separate 100-year records for the purpose of analysis. The dependable flows were found for each of the fifty records for each of eight reservoir sizes. The ninety percent confidence interval and the dependable flow for each of eight reservoir sizes was found. The model had a negative bias of approximately thirteen percent. This bias appeared to be alleviated when the dependable flow was expressed as a percent of the average flow for the period in question. It appears that there is great variability in the estimated value of the dependable flow in the James River. / Master of Science

Planktonic Foraminifera were examined from the Aquia Formation (Late Paleocene) from 2 localities in the Aquia type area along the Potomac River 7 miles southeast of Stafford, Virginia to: identify taxa present, and to effect biostratigraphic correlation with other Paleocene studies on the Virginia Coastal Plain. Two genera and twenty-two species were recovered, allowing recognition of the Globorotalia pseudomenardii and Globorotalia velascoensis zones, and correlation with The Oak Grove Core, 23 miles to the southeast (Gibson, et al. 1980), and a Pamunkey River locality 50 miles to the south (Seaton, 1982). This correlation shows equal thicknesses of the Aquia within zonal boundaries over the Potomac River - Oak Grove - Pamunkey River area, suggesting uniform rates of Aquia sedimentation in this portion of the Salisbury Embayment. Correlation of the Oak Grove Core, which was zoned via the Tertiary NP zonation indicates the presence of NP zones 5,6-?7,8,9 in the Aquia type area. / Master of Science

No description available.

Yes / Within river systems, the process of bed-forming is intricate, dynamic and is shaped by different factors. Hydraulic forces exerted by water flow play a crucial role, forming the bed substrate over time. Additionally, the presence of vegetation within the riverbed and along its banks introduces further complexity, as the interaction between plants and hydrodynamics can alter sediment transport patterns and riverbed morphology. The movement of both suspended particles and bedload materials within the water column contributes to the ongoing riverbed landscape evolution. The primary aim of this editorial collection is to assemble an extensive range of research methodologies aimed to inform engineering practices pertinent to river management. Through an exhaustive exploration of various topics, including water quality indexing, erosion and sedimentation patterns, influence of vegetation, hydrological modelling for understanding flow dynamics, and identification of critical hydraulic parameters with the utilisation of both analytical and experimental modelling techniques, this paper endeavours to provide valuable insights derived from rigorous research efforts. By synthesising and presenting these findings, we offer a resource that can effectively guide future endeavours in river engineering and related disciplines.

No / In the search for sustainable city solutions, engineers face a bottleneck situation in balancing development and the intensified environmental challenges induced by scaled-up flooding, over-grown river vegetation, sediment transport, bridge and coastal scouring, and excessive pollution. The coupling impacts of uncontrolled flood and sediment to a city has caused difficulty in its management. Various numerical, theoretical, and experimental approaches have been proposed to reproduce flow and sediment transport conditions in real-world urban rivers, in order to perfect management strategies for them. This reprint, which is built from a well-planned journal’s Special Issue, aims to construct a collection of state-of-the-art studies and technologies to give insights to the related environmental, river, and sustainable city research and engineering communities. It is related and, hence, useful for environmental, river, and hydraulic engineers, authorities, and researchers to understand the current state-of-the-art practices in urbanized flow modelling, as well as vegetation- and sediment-related management. It also serves as a good knowledge source for research, post- or undergraduate students, in terms of knowledge about the most up-to-date topical advances.

Thesis (M.A.)--Boston University / PLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis or dissertation. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you. / Concentrations of enteric bacteria exceeding the State of Massachusetts water quality limits for shellfish harvesting without depuration have prompted the closure of nearly one third of the shellfish beds in the northern reaches of the West Branch of the Westport River Estuary. / 2999-01-01

Fluvial channel geometry is controlled by the interaction of a number of geologic and hydraulic variables. The width of mixed alluvial-bedrock channels generally is a function of discharge, with variations due to local conditions. The aspect ratio (width/depth) of channels is heavily influenced by substrate size and erodibility. How channel width and aspect ratio vary as a function of other variables, such as structure, lithology, slope, large scale valley topography, and rock uplift, has not been fully quantified. The New River is ideal for examining these relationships because it shows considerable variability in width and aspect ratio and flows through three structurally and lithologically distinct geologic provinces. Through these provinces, the New River does not follow the expected trends of channel widening with increasing drainage area. Topographic maps show that channel width of the New River has a significant variation that far outscores an overall widening downstream. Aspect ratios for the New River are also large, approaching 500. We collected a field data set of 29 sites of the river's channel geometry, along with characteristics of bedrock, sediment, and confinement. Fifteen of the 29 sites are bedrock reaches. The data set allows empirical analysis of how width and aspect ratio of the New River are related to different variables, including slope, discharge, flow velocity, curvature, trend, bedrock type, and structure. Sediment characteristics and confinement of the channel do not affect channel morphology. Bedrock is shown to affect channel width directly through the percent of bedrock exposed in the channel and indirectly through the modified rock mass strength, rock hardness, obliquity to regional strike, dip orientation, and degree of joint intersection. / Master of Science

LD2668 .T4 1966 E47 / Master of Science

Master of Landscape Architecture / Department of Landscape Architecture/Regional and Community Planning / Melanie F. Klein / Greenways are an evolving landscape form, adapting to the needs of humans through time. Rooted in the work of Frederick Law Olmsted, greenways have progressed to become an international movement. Throughout this progression, three generations of greenways are recognizable—Generation 1: Parkways and Boulevards, Generation 2: Trail-Oriented Recreation, Generation 3: Multi-Objective (Searns 2002). Given the ideals of sustainability that drive our contemporary society, a fourth generation is poised to emerge. Responsive to sustainability, the fourth generation will be envisioned as a holistic system, structured within the frameworks of landscape ecology theory as developed by Richard Forman, and expanded with the progressive thinking of Jack Ahern and Kristina Hill. River North Greenway in Denver, Colorado is prime for transformation. Compromised by its industrial context, yet vitalized through the flow of the South Platte River and the infill development growing up the valley from Downtown Denver, River North will be re-defined as a holistic system. Utilizing the spatial pattern and process dynamics that define ecological theory (Forman 1996), abiotic, biotic, and cultural functions (Ahern 2007) will become the fundamental elements in strategizing the greenway as a multi-scalar dynamic mosaic (Hill 2005). River North Greenway will become a complexity of cultural activity and abiotic and biotic health, balancing programmed space with the enhancement and restoration of ecosystems. It will transform the City of Denver, enriching the connection between the city and its river, the people and nature. With its rich history and present potential, River North can become a timeless piece of Denver’s urban landscape, shaping meaningful human experiences and preserving nature within the built environment for future generations. In turn, it can propel the greenway movement towards a fourth generation.