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Improving How Gully Erosion And River Sediment Transport Processes Are Represented In Queensland Catchment Models
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Book Synopsis Improving how Gully Erosion and River Sediment Transport Processes are Represented in Queensland Catchment Models by : Ian Philip Prosser
Download or read book Improving how Gully Erosion and River Sediment Transport Processes are Represented in Queensland Catchment Models written by Ian Philip Prosser and published by . This book was released on 2018 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report reviews the current understanding of gully erosion and river sediment transport processes in Queensland catchments, and details how these processes have been represented in water quality models over the last 20 years. Developed through a consensus approach, the report identifies the research, data collection and conceptual design needs to improve these modelling practices, to make them more relevant to the growing needs of land management agencies and communities.
Book Synopsis Murray-Darling Basin, Australia by : Barry Hart
Download or read book Murray-Darling Basin, Australia written by Barry Hart and published by Elsevier. This book was released on 2020-10-23 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: Murray-Darling Basin, Australia: Its Future Management is a much-needed text for water resources managers, water, catchment, estuarine and coastal scientists, and aquatic ecologists. The book first provides a summary of the Murray-Darling River system: its hydrology, water-related ecological assets, land uses (particularly irrigation), and its rural and regional communities; and management within the Basin, including catchments and natural resources, water resources, irrigation, environment, and monitoring and evaluation. Additionally, the recent major water reforms in the Basin are discussed, with a focus particularly on the development and implementation of the Basin Plan. Murray-Darling Basin, Australia: Its Future Management then provides an analysis of the next set of policy and institutional reforms (environmental, social, cultural and economic) needed to ensure the Basin is managed as an integrated system (including its water resources, catchment and estuary) capable of adapting to future changes. Six major challenges facing the Basin are identified and discussed, particularly within the context of predicted changes to the climate leading to an increased frequency of drought and a hotter and dryer future. Finally, a 'road map' or 'blueprint' to achieve more integrated management of the Basin is provided, together with some 'key lessons' of relevance to others involved in the management of multijurisdictional river Basins. - Provides a consolidated account of the Murray-Darling Basin system; an area of global relevance to those interested in rebalancing river systems where the water resources have been over allocated - Offers a detailed analysis of the current system and its management, with a focus on water and ecosystem management - Discusses a number of key challenges, particularly those related to climate change, facing future reforms to the Murray-Darling Basin Plan - Provides a blueprint for changes needed to ensure the Basin is managed as an integrated whole (from catchment to coast)
Book Synopsis River Basin Management X by : S. Mambretti
Download or read book River Basin Management X written by S. Mambretti and published by WIT Press. This book was released on 2019-07-16 with total page 241 pages. Available in PDF, EPUB and Kindle. Book excerpt: Papers presented at the 10th in a series of conferences on River Basin Management are contained in this book. The included works mark a growing global interest in the planning, design and management of river basin systems and take in to account all aspects of Hydrology, Ecology, Environmental Management, Flood Plains and Wetlands.
Book Synopsis From Soil Erosion to Sediment Load by : Florence Tan
Download or read book From Soil Erosion to Sediment Load written by Florence Tan and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Large uncertainties exist in the estimated load of sediment being moved through the land surface system and ultimately reaching the world’s coastal oceans. The lack of reliable information on the amount of sediment in rivers limits our understanding of the impact of sediment on fluvial ecosystems and the downstream environment. To account for the scarcity of sediment observations worldwide, many studies have attempted to develop global erosion and sediment transport models with the goal of refining sediment load estimates. While considerable advancement has been made in the development of large-scale, spatially explicit soil detachment and fluvial sediment transport models, the transfer of sediment on land, before the material reaches the river network, has largely been overlooked during large-scale modelling efforts. Yet, the dynamics of sediment on slopes, known as hillslope sediment connectivity, provide the critical link relating plot-scale soil erosion rates to catchment-wide sediment yield in rivers. This thesis investigates the large-scale applicability of three existing hillslope sediment connectivity modelling approaches, two of which were originally developed for small-scale applications (the IC-SDR and SEDEM approaches) and one developed globally using a coarse grid cell resolution of ~10km (the Rouse Number approach). Their performance for high-resolution large-scale applications is assessed by applying them over the African continent using globally applicable data of 90 m resolution. First, 46 African catchments with reliable sediment observations were selected by conducting a screening process based on sampling frequency, length of measuring period, location accuracy, sampling method, and the presence of major known sediment deposition zones such as lakes, dams, and floodplains. Then, the three hillslope sediment connectivity approaches were applied over the selected catchments and calibrated and/or validated using the catchment sediment load observations. Cursory applications of the three approaches using literature parameter values revealed that, while the IC-SDR approach slightly outperformed the SEDEM and Rouse Number methods, predictions from all three approaches highly underestimated observed sediment load in the receiving river. Therefore, parameter configurations reported by studies conducted at smaller scales or coarser resolution are found to be inappropriate at the scale and resolution of this study. In fact, applying the uncalibrated modelling approaches worsens the accuracy of the sediment load estimates compared to original RUSLE-produced soil detachment rates. Finally, an in-depth application of the IC-SDR approach, in which the model was refined and calibrated, improved RUSLE-produced sediment load estimates using a single, regional best-fit parameter configuration, indicating the strong potential of the IC-SDR approach for global applications. Findings from this thesis can contribute to larger sediment modelling efforts aiming to develop a harmonious global erosion model representing all erosion processes and sediment transfer dynamics, from the source point of soil detachment to the final delivery to the world’s oceans"--
Book Synopsis River restoration: a strategic approach to planning and management by : Speed, Robert
Download or read book River restoration: a strategic approach to planning and management written by Speed, Robert and published by UNESCO Publishing. This book was released on 2016-09-19 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Alluvial Gully Erosion Rates and Processes Across the Mitchell River Fluvial Megafan in Northern Queensland, Australia by : Jeffrey Gray Shellberg
Download or read book Alluvial Gully Erosion Rates and Processes Across the Mitchell River Fluvial Megafan in Northern Queensland, Australia written by Jeffrey Gray Shellberg and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract : Gully erosion is the process by which running water cuts new unstable channels into erodible regolith. It causes severe land degradation, is a major component of contemporary sediment budgets, and is a major source of sediment pollution to aquatic ecosystems. In northern Australia, there is widespread gully erosion into unconfined alluvial deposits on active and abandoned floodplains {u2013} here defined as alluvial gully erosion. In catchments draining to the Gulf of Carpentaria, alluvial gullies can cover 0.2% to 1.0 % of the total catchment area and locally>10% of the floodplain area. Alluvial gully erosion has been poorly documented and differs substantially from colluvial or hillslope gullying in south-eastern or northern Australia. The objectives of this research were to investigate and quantify alluvial gully erosion processes and rates at a variety of spatial and temporal scales across a pilot study area, which encompasses the Mitchell River fluvial megafan on the Cape York Peninsula in northern Queensland. Along the Mitchell megafan, alluvial gullies are concentrated along main drainage channels. Their scarp heights and potential energy are highly correlated to the local relief between the floodplain and river thalweg, which is a result of river incision into the megafan since the Pleistocene. Other factors such as floodplain hydrology, soil texture and chemistry, vegetation cover, and land-use disturbance also influence the distribution and propagation of gullies, via changes in the driving and resisting forces. The frequency of river flood inundation of alluvial gullies on the floodplain changes longitudinally according to river incision and confinement. Near the top of the megafan, flood water is contained in the macro-channel up to the 100-yr recurrence interval (RI) but still backwaters adjacent alluvial gullies. In downstream Holocene floodplains, complete inundation of alluvial gullies occurs beyond the 3- to 5-yr RI and can contribute significantly to total annual erosion. However, a majority of gully scarp retreat is still driven by direct rainfall and infiltration-excess runoff, with the 24-hr rainfall total being the most predictive variable. This direct erosion is enhanced by inherent soil dispersibility and the lack of vegetative cover, with the later if present having the potential to dissipate the effective kinetic energy of rainfall and promote infiltration.
Book Synopsis Variability in Stream Erosion and Sediment Transport by : International Association of Hydrological Sciences
Download or read book Variability in Stream Erosion and Sediment Transport written by International Association of Hydrological Sciences and published by . This book was released on 1994 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Soil Erosion and Sediment Redistribution in River Catchments by : Philip N. Owens
Download or read book Soil Erosion and Sediment Redistribution in River Catchments written by Philip N. Owens and published by CABI. This book was released on 2006 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reviews the major achievements recently made in soil erosion and sediment redistribution research and management, and identifies future requirements. The book presents work from key players in river basin soil erosion and sediment redistribution from sources to sinks, field to riverbank, from academia to policy and industry. It examines the developments made in three themes - measurement, modelling and management - and covers a variety of scales (in both time and space) and geographical locations.
Book Synopsis Sediment Yield Modelling in the Upper Tsitsa Catchment, Eastern Cape, South Africa by : Simone Norah Pretorius
Download or read book Sediment Yield Modelling in the Upper Tsitsa Catchment, Eastern Cape, South Africa written by Simone Norah Pretorius and published by . This book was released on 2016 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Mzimvubu River is the largest river in South Africa without a dam. The Department of Water and Sanitation has identified the Tsitsa River Catchment on the Mzimvubu River as a potential site for a water resource development. The soils in the Tsitsa Catchment are prone to extreme soil erosion, in particular gullying. The sediment generated from these gullies and other forms of erosion will have a detrimental effect on any water resource development. Changing climate and land use will also affect soil erosion dynamics and thus need to be considered before any development is planned in the catchment. Previous studies have mapped the gully systems in the catchment as well as used hydrological models to determine erosion from sheet and rill processes. However, these studies did not account for the effects of change in land use or climate. The mapping of the gullies was also done manually, which is extremely time-consuming and is susceptible to human error. This study aims to determine the sediment yield in the catchment under current and future climate and land use scenarios as well as develop a methodology to identify and map the gullies automatically in order to determine the rate of gully growth from a time series of images. The study had two main components, the first was to study gully erosion in the catchment. In the second section the sheet and rill aspects of erosion under various climate and land use changes were modelled. Using object-based image analysis (OBIA) on SPOT 5 images a methodology was created to automate the task of gully mapping. This was applied to two SPOT 5 data sets one from 2007 and the other from 2012 in order to determine the rate of gully growth over the five-year period. Various accuracy assessments were also conducted to assess the accuracy of the methodology. It was determined that the methodology had an overall accuracy of 98% for the 2012 image and 99% for the 2007 image. There was an overall increase in gully erosion in the catchment by 28% in the five-year period. The estimated sediment yield generated from the gullies ranged between 7 and 14 t/ha/yr. It was concluded that OBIA resulted in faster processing times and more objective classification results. The second part of the study used the Soil and Water Assessment Tool (SWAT) to determine the sediment yield from sheet and rill erosion. SWAT only considers sheet and rill aspects of erosion and disregards gully erosion thus both methods needs to be incorporated into the study in order to understand the complete dynamics of soil erosion in the catchment. SWAT was used to model the current land use and climate scenario using land cover data and observed weather data for the 2007-2012 period. On average 0.18 t/ha/yr of sediment is generated in the catchment from sheet and rill erosion. Using climate data from 1969 and projected to 2100, future sediment yield from sheet and rill erosion was estimated. The effects of possible land use change on sheet and rill erosion was also estimated by changing the land use component in SWAT into various crops that may be cultivated in the catchment over the next century. The results of the land use change showed that the current land use is optimal for minimal sheet and rill erosion and converting to maize crops will have the greatest impact on sediment yield This study aimed to understand the dynamics of soil erosion under current and changing land use and climate scenarios. It was concluded that the majority of the sediment is derived from gully erosion, which accounts for up to 70 times more sediment yield annually than sheet and rill erosion. Gully formation and propagation in the catchment is of critical concern to any land or water developments proposed for the Tsitsa Catchment.
Book Synopsis Handbook of Engineering Hydrology by : Saeid Eslamian
Download or read book Handbook of Engineering Hydrology written by Saeid Eslamian and published by CRC Press. This book was released on 2014-03-21 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: While most books only examine the classical aspects of hydrology, the three-volume set covers multiple aspects of hydrology, and includes contributions from experts from more than 30 countries. It examines new approaches, addresses growing concerns about hydrological and ecological connectivity, and considers the worldwide impact of climate change. It also provides updated material on hydrological science and engineering, discussing recent developments as well as classic approaches. Published in three books, Fundamentals and Applications; Modeling, Climate Change, and Variability; and Environmental Hydrology and Water Management, the entire set consists of 87 chapters, and contains 29 chapters in each book. The chapters in this book contain information on: Long-term generation of scheduling of hydro plants, check dam selection procedures in rainwater harvesting, and stochastic reservoir analysis Ecohydrology for engineering harmony in the changing world, concepts, and plant water use Conjunctive use of groundwater and surface water Hydrologic and hydraulic design in green infrastructure Data processing in hydrology, optimum hydrometric site selection and quality control, and homogenization of climatological series Cold region hydrology, evapotranspiration, and water consumption Modern flood prediction and warning systems, and satellite-based systems for flood monitoring and warning Catchment water yield estimation, hydrograph analysis and base flow separation, and low flow hydrology Sustainability in urban water systems and urban hydrology Students, practitioners, policy makers, consultants and researchers can benefit from the use of this text.
Download or read book Marine & Freshwater Research written by and published by . This book was released on 2005 with total page 532 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Predicting Rainfall Erosion Losses by : Walter H. Wischmeier
Download or read book Predicting Rainfall Erosion Losses written by Walter H. Wischmeier and published by . This book was released on 1978 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Universal Soil Loss Equation (USLE) enables planners to predict the average rate of soil erosion for each feasible alternative combination of crop system and management practices in association with a specified soil type, rainfall pattern, and topography. When these predicted losses are compared with given soil loss tolerances, they provide specific guidelines for effecting erosion control within specified limits. The equation groups the numerous interrelated physical and management parameters that influence erosion rate under six major factors whose site-specific values can be expressed numerically. A half century of erosion research in many States has supplied information from which at least approximate values of the USLE factors can be obtained for specified farm fields or other small erosion prone areas throughout the United States. Tables and charts presented in this handbook make this information readily available for field use. Significant limitations in the available data are identified.
Book Synopsis Mathematical Models of Small Watershed Hydrology and Applications by : Vijay P. Singh
Download or read book Mathematical Models of Small Watershed Hydrology and Applications written by Vijay P. Singh and published by Water Resources Publication. This book was released on 2002 with total page 984 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive account of some of the most popular models of small watershed hydrology and application ~~ of interest to all hydrologic modelers and model users and a welcome and timely edition to any modeling library
Book Synopsis Geomorphology in the Anthropocene by : Andrew S. Goudie
Download or read book Geomorphology in the Anthropocene written by Andrew S. Goudie and published by Cambridge University Press. This book was released on 2016-10-10 with total page 335 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Anthropocene is a major new concept in the Earth sciences and this book examines the effects on geomorphology within this period. Drawing examples from many different global environments, this comprehensive volume demonstrates that human impact on landforms and land-forming processes is profound, due to various driving forces, including: use of fire; extinction of fauna; development of agriculture, urbanisation, and globalisation; and new methods of harnessing energy. The book explores the ways in which future climate change due to anthropogenic causes may further magnify effects on geomorphology, with respect to future hazards such as floods and landslides, the state of the cryosphere, and sea level. The book concludes with a consideration of the ways in which landforms are now being managed and protected. Covering all major aspects of geomorphology, this book is ideal for undergraduate and graduate students studying geomorphology, environmental science and physical geography, and for all researchers of geomorphology.
Download or read book Water Research in Australia written by and published by . This book was released on 1985 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :IAHS International Commission on Continental Erosion. Symposium Publisher :Iahs Press ISBN 13 : Total Pages :644 pages Book Rating :4.X/5 (3 download)
Book Synopsis Sediment Dynamics in Changing Environments by : IAHS International Commission on Continental Erosion. Symposium
Download or read book Sediment Dynamics in Changing Environments written by IAHS International Commission on Continental Erosion. Symposium and published by Iahs Press. This book was released on 2008 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Catchments and Corals by : Miles Jonathan Furnas
Download or read book Catchments and Corals written by Miles Jonathan Furnas and published by . This book was released on 2003 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: This text provides the first comprehensive description of the state of the Great Barrier Reef catchment, modern levels of runoff to the reef and the influence of runoff on coastal reef ecosystems.
