Download or read book Urban Channel Erosion written by William Whipple and published by . This book was released on 1978 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Erosional Aspects of Managing Urban Streams written by William Whipple and published by . This book was released on 1980 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sediment Problems in Urban Areas written by Harold P. Guy and published by . This book was released on 1970 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Residential Erosion and Sediment Control written by Urban Land Institute and published by . This book was released on 1978 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Channel Erosion Risk Index written by William C. Hughes and published by . This book was released on 1978 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stream Channel Erosion in a Rapidly Urbanizing Semi arid Region written by and published by . This book was released on 2018 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: Urbanization can lead to stream channel erosion and ecological degradation. The majority of studies have focused on the impacts of urban development on channel morphology in developed regions, such as the United States and Europe, where urbanization is typically characterized by watershed-scale land alterations, such as the conversion of undeveloped land to impervious urban areas. This dissertation focuses on a rapidly developing, semi-arid region, Los Laureles Canyon watershed (LLCW), located in Tijuana, Mexico, which is characterized by steep slopes and highly erodible material. Urban development in Tijuana has led to excessive hillslope and channel erosion, and subsequent infrastructure failure of homes, water main pipes, and unpaved roads and sedimentation of the downstream Tijuana Estuary in San Diego, CA. The main objectives of this dissertation are to investigate the impact of urbanization and in-channel alterations on stream channel evolution, highlight channel sources and sinks of sediment, and evaluate the overall importance of channel erosion on the sediment budget of LLCW for future sediment mitigation plans. First, traditional geomorphic survey methods and Structure-from-Motion (SfM) photogrammetry techniques were utilized to describe the spatial patterns in stream channel geometry in LLCW and to provide a regional comparison of channel erosion in Tijuana, MX to reference and urbanized watersheds in southern California. Channels in Tijuana are statistically larger than urban and reference channels in southern California and major hotspots of erosion are located downstream of hardpoints, or non-erodible features. Second, to quantitatively evaluate channel evolution and to determine the driving mechanisms to channel instability downstream of hardpoints, field data were used to develop a computational model of channel evolution, CONCEPTS (CONservational Channel Evolution and Pollutant Transport System), for LLCW. A scenario analysis was conducted to quantitatively assess the impact of urban channel alterations, including hardpoint installation, slope alteration, bed composition change, and vegetation removal, on channel incision, widening, and sediment load. Hardpoints prevented incision in the upstream direction by serving as grade control, and only caused local channel instabilities downstream. Channel erosion is caused mainly by the destruction of the natural channel, including channel burial, straightening, steepening, and removal of riparian vegetation, often performed in the process of turning channels into roads. Reformation of an enlarged river reach that is disconnected from the floodplain, leads to higher flow depths constrained in the channel, larger shear stresses, and accelerated channel incision. Lastly, a watershed-scale model of hillslope processes, AnnAGNPS, integrated with CONCEPTS was developed for LLCW todetermine the spatial pattern of channel sources and sinks of sediment in the watershed and evaluate the overall importance of channel processes on the sediment budget for future sediment mitigation plans. Channel erosion contributes approximately 60% of the total sediment budget and only a third of the entire stream channel network is generating 90% of the channel-derived sediment load. This indicates that channel erosion is a dominant source of sediment in LLCW and targeted stream stabilization measures could potentially reduce a large proportion of sediment load to the Tijuana Estuary. However, coarsening of the bed alone may not decrease mean annual channel-derived sediment yield, as armoring of the bed can decrease channel incision but channel widening may be exacerbated. Overall, urbanization of the valley floor and alterations to the stream channel have led to constrained and enlarged stream channels. This dissertation provides an example of the use of a variety of geomorphic field methods, including traditional topographic survey methods and Structure-from-Motion (SfM) photogrammetry techniques, paired with a comprehensive modelling framework to provide an understanding of the driving mechanisms of channel instability and the overall importance of channel processes on the sediment budget to support local and federal sediment management plans in a rapidly developing, semi-arid region.
Download or read book Proceedings written by and published by . This book was released on 1980 with total page 404 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Urban Soil Erosion and Sediment Control written by National Association of Counties Research Foundation and published by . This book was released on 1970 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Watershed Hydrology written by Vijay P. Singh and published by Allied Publishers. This book was released on 2003 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fundamentals of Urban Runoff Management written by Earl Shaver and published by . This book was released on 2007 with total page 327 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Restoring Streams in Cities written by Ann L. Riley and published by . This book was released on 1998 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ann L. Riley describes an interdisciplinary approach to stream management that does not attempt to control streams, but rather considers the stream as a feature in the urban environment. She presents a logical sequence of land-use planning, site design, and watershed restoration measures along with stream channel modifications and floodproofing strategies that can be used in place of destructive and expensive public works projects. She features examples of effective and environmentally sensitive bank stabilization and flood damage reduction projects, with information on both the planning processes and end results. Chapters provide: history of urban stream management and restoration; information on federal programs, technical assistance, and funding opportunities; and in-depth guidance on implementing projects: collecting watershed and stream channel data, installing revegetation projects, protecting buildings from overbank stream flows.
Download or read book Water in the Urban Environment written by William Joseph Schneider and published by . This book was released on 1981 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Use of Land Surface Erosion Techniques with Stream Channel Sedimentation Models written by D. Michael Gee and published by . This book was released on 1996 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Urbanization on a Small Perennial Stream written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Little is known about the coarse load carried by streams in urban areas or the length of time needed for stream channel adjustments to urban conditions. In this study, I examine the history of urbanization in the basin of Second Creek, the status of the channel, and the sediment load of the creek in recent years. Second Creek is a small perennial stream whose 18.6 km2 drainage basin is almost entirely contained within the City of Knoxville, Tennessee. Almost all of the drainage basin was developed more than 40 years ago, and is now urban and suburban in character. For this study, I inspected the channel of Second Creek, measured its dimensions in many places, and recorded the types of materials present and evidence of recent deposition and erosion. My analysis of channel materials included measuring the sizes of more than 100 coarse particles on the streambed at each of several locations. In addition, I measured stream discharge and suspended sediment load near the mouth of the stream during several low and high flows, measured suspended load for a year using rising stage samplers, and estimated bedload by calculating the volume of sediment deposited at the mouth of the stream. Data made available as a result of this study include suspended sediment concentrations from rising stage samplers at five locations for a year of record (October 1998 to October 1999), discharge measurements and suspended sediment concentrations from nine storm events, bedload particle sizes from eight sites, and cross-sectional surveys from 18 sites. If a stream channel is adjusted to present-day hydrologic and sediment load regimes, little net deposition or erosion is expected to take place, yet my examination of the channel of Second Creek reveals that both deposition and erosion have occurred in recent decades. Sediment deposits in box culverts and concrete-lined channel reaches cannot be more than 30 years old, but I found few signs of present-day deposition. Rather than deposition, much of the channel (where not lined with concrete or thick riprap) shows signs of recent erosion. Therefore, channel erosion appears to have replaced deposition as the dominant process in the last few years. This suggests that Second Creek has not adjusted to the urban conditions of its drainage basin, and that channel enlargement is occurring in many places. Impervious surfaces and lawns cover most potentially erodible soil in the drainage basin, so the suspended load is expected to be low, yet measurements show it to be high. Channel erosion is likely to be contributing suspended sediment and coarse particles to the stream. reservoir at the stream outlet indicate the amount of bedload carried by the creek in the last 50 years to be low. to respond to major changes made decades ago and to smaller, more recent changes.
Download or read book Erosion Sediment Discharge and Channel Morphology in the Upper Chattahoochee River Basin Georgia with a Discussion of the Contribution of Suspended Sediment to Stream Quality written by and published by . This book was released on 1980 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Evaluation of Channel Instability in an Urban Stream Butler Ohio and Development of a Channel Stability Assessment Protocol written by Eileen Marie Bader and published by . This book was released on 2009 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Severe erosion has been observed in Bull Run, a small suburban stream in Butler County, Ohio. Erosion has led to extremely steep banks with extensive bare sediment exposed throughout large portions of the stream. Fallen trees, exposed roots, and failed banks are common along the length of Bull Run. The channel was investigated to understand the degree of current channel instability and estimate future instability. This study assessed the state of instability within Bull Run, identified which characteristics of Bull Run are most indicative of channel instability, and developed a protocol for assessing stream channel instability. While other rapid channel stability assessments exist, this protocol emphasizes functionality within time and budget constraints and is suitable for use by a novice.
Download or read book Urban Stormwater Management in the United States written by National Research Council and published by National Academies Press. This book was released on 2009-03-17 with total page 611 pages. Available in PDF, EPUB and Kindle. Book excerpt: The rapid conversion of land to urban and suburban areas has profoundly altered how water flows during and following storm events, putting higher volumes of water and more pollutants into the nation's rivers, lakes, and estuaries. These changes have degraded water quality and habitat in virtually every urban stream system. The Clean Water Act regulatory framework for addressing sewage and industrial wastes is not well suited to the more difficult problem of stormwater discharges. This book calls for an entirely new permitting structure that would put authority and accountability for stormwater discharges at the municipal level. A number of additional actions, such as conserving natural areas, reducing hard surface cover (e.g., roads and parking lots), and retrofitting urban areas with features that hold and treat stormwater, are recommended.
