Download or read book Holocene Environmental Evolution in the Yellow River Delta written by Fangyu Zeng and published by . This book was released on 2017 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Yellow River is the second largest river in China, world-famous for its highly sediment-laden water. The Yellow River delta is located in the transitional zone of the river sea interaction, where land and sea interact intensely. This area not only is the sink of the materials from the Yellow River, but also the source of the Yellow River dispersal system into the Bohai Sea. The Yellow River experienced many instances of channel switching and formed ten superlobes during the latest Quaternary. From 8800 yr. cal. BP., the Yellow River has experienced three transgressions. According to the study of Yi et al. (2014), the Yellow River deltas switch and form a new superlobe about every 1500 year. This thesis studied three sediment cores by applying geostatistical analysis and grain size VPCA analysis. I confirmed the approximately 1500-year periodicity for new superlobes by applying VPCA to grain size spectra and by correlating sediment cores in order to build age models to identify the different facies and layers. Smaller crevasse-splay cycles occurred on much shorter cycles, on the order of several decades.The ~1500-yr cycle is probably caused by the interaction of the Eastern Asian Winter Monsoon, the Kuroshio Current, and the Arctic Oscillation. Sea level change is also a very important consideration. Most major river deltas have been found to exhibit a 1000 to 2000-year cycle, which has been attributed to variations in sea level change. However, during the late Holocene, after 6000 Cal yr. BP, when sea levels had essentially reached the modern elevation, the Yellow River delta became quiescent and the Bohai Sea was more stable. In the first chapter, I discuss the Yellow River's history and geological background and describe previous studies on the Yellow River delta. Chapter 2 discusses the methods that have been used in the thesis, specifically the Malvern Mastersizer and geostatical methods including VPCA (varimax principal component analysis) and it describes how to build age models and the quantitative stratigraphic correlation method (Match-2.3.1 in Matlab). I found that VPCA analysis documents that silt and clay are dominant components for cores YDZ-1, YDZ-2, and YDZ-3. The third chapter describes and discusses the wavelet analysis on VPCA components, and demonstrates that the Yellow River delta has a 1500~ year periodicity for the sediment deposition. Less

Download or read book Holocene Environmental Evolution in the Yangtze River Valley written by Guo jia zi ran ke xue ji jin wei yuan hui and published by . This book was released on 2008 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sedimentary Evolution and Hazardous Geology during the Holocene in the Yangtze River and the Red River Deltas and the Neighboring Coastal Areas written by Jian Liu and published by Frontiers Media SA. This book was released on 2024-04-19 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Yangtze River (Changjiang) and the Red River (Song Hong) that originate in highlands of the Himalayas and Tibetan Plateau, two of the largest rivers in East and Southeast Asia in terms of water and sediment discharge into oceans, play a pivotal role in the global biogeochemical cycle. The Yangtze River Delta is located at the west coast of the East China Sea and the Red River delta at the west coast of the Gulf of Tonkin in the South China Sea. Both were initiated during the early to middle Holocene.

Download or read book Deltas and Humans written by Thomas S. Bianchi and published by Oxford University Press. This book was released on 2016 with total page 185 pages. Available in PDF, EPUB and Kindle. Book excerpt: Humans have had a long relationship with the ebb and flow of tides on river deltas around the world. The fertile soils of river deltas provided early human civilizations with a means of farming crops and obtaining seafood from the highly productive marshes and shallow coastal waters associated with deltas. However, this relationship has at times been both nurturing and tumultuous for the development of early civilizations. The vicissitudes of seasonal changes in river flooding events as well as frequently shifting deltaic soils made life for these early human settlements challenging. These natural transient processes that affect the supply of sediments to deltas today are in many ways very similar to what they have been over the millennia of human settlements. But something else has been altered in the natural rhythm of these cycles. The massive expansion of human populations around the world in both the lower and upper drainage basins of these large rivers have changed the manner in which sediments and water are delivered to deltas. Because of the high density of human populations found in these regions, humans have developed elaborate hydrological engineering schemes in an attempt to "tame" these deltas. The goal of this book is to provide information on the historical relationship between humans and deltas that will hopefully encourage immediate preparation for coastal management plans in response to the impending inundation of major cities, as a result of global change around the world.

Download or read book The Holocene written by Neil Roberts and published by John Wiley & Sons. This book was released on 2013-07-01 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: In its first edition, The Holocene provided undergraduates with a much-needed coherent scientific account of the great transformation of nature that had taken place during the Holocene, the last 10,000 years in the history of the planet and the period in which we are all now living. This period has included major shifts in climate and human culture, and in the natural environment at every level. Completely revised and updated to take full account of the most recent advances, the new edition of this established text includes substantial material on scientific progress in the understanding of climate change and abrupt climatic events, of disturbance effects on the landscape, and of ice core records. Not only have improved dating methods, such as luminescence, been included but the timescale for the book has been moved to calendar (i.e. real) years. Coverage and supporting case study material have also been broadened and extended.

Download or read book Wetland Carbon and Environmental Management written by Ken W. Krauss and published by John Wiley & Sons. This book was released on 2021-11-23 with total page 484 pages. Available in PDF, EPUB and Kindle. Book excerpt: Explores how the management of wetlands can influence carbon storage and fluxes. Wetlands are vital natural assets, including their ability to take-up atmospheric carbon and restrict subsequent carbon loss to facilitate long-term storage. They can be deliberately managed to provide a natural solution to mitigate climate change, as well as to help offset direct losses of wetlands from various land-use changes and natural drivers. Wetland Carbon and Environmental Management presents a collection of wetland research studies from around the world to demonstrate how environmental management can improve carbon sequestration while enhancing wetland health and function. Volume highlights include: Overview of carbon storage in the landscape Introduction to wetland management practices Comparisons of natural, managed, and converted wetlands Impact of wetland management on carbon storage or loss Techniques for scientific assessment of wetland carbon processes Case studies covering tropical, coastal, inland, and northern wetlands Primer for carbon offset trading programs and how wetlands might contribute The American Geophysical Union promotes discovery in Earth and space science for the benefit of humanity.Its publications disseminate scientific knowledge and provide resources for researchers, students, and professionals.

Download or read book Biogeochemical Dynamics at Major River Coastal Interfaces written by Thomas Bianchi and published by Cambridge University Press. This book was released on 2014 with total page 673 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive, state-of-the-art synthesis of biogeochemical dynamics and the impact of human alterations at major river-coastal interfaces for advanced students and researchers.

Download or read book Holocene Climate Change and Environment written by Navnith Kumaran and published by Elsevier. This book was released on 2021-09-24 with total page 693 pages. Available in PDF, EPUB and Kindle. Book excerpt: Holocene Climate Change and Environment presents detailed, diverse case studies from a range of environmental and geological regions on the Indian subcontinent which occupies the central part of the monsoon domain. This book examines Holocene events at different time intervals based on a new, high-resolution, multi-proxy records (pollen, spores, NPP, diatoms, grain size characteristics, total organic carbon, carbon/nitrogen ratio, stable isotopes) and other physical tools from all regions of India. It also covers new facilities in chronological study and luminescence dating, which have added a new dimension toward understanding the Holocene glacial retreats evolution of coastal landforms, landscape dynamics and human evolution. Each chapter is presented with a unified structure for ease of access and application, including an introduction, geographic details, field work and sampling techniques, methods, results and discussion. This detailed examination of such an important region provides key insights in climate modeling and global prediction systems. - Provides data and research from environmentally and geologically diverse regions across the Indian subcontinent - Presents an integrated and interdisciplinary approach, including considerations of human impacts - Features detailed case studies that include methods and data, allowing for applications related to research and global modeling

Download or read book Global Change in the Holocene written by John Birks and published by Routledge. This book was released on 2014-02-24 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Holocene spans the 11,500 years since the end of the last Ice Age and has been a period of major global environmental change. However the rate of change has accelerated during the last hundred years, due largely to human impacts and this has led to a growing concern for the future of our environmental resources. Global Change in the Holocene demonstrates how reconstructing the record of past environmental change can provide us with essential knowledge about how our environment works and presents the reader with an informed viewpoint from which to project realistic future scenarios. The book brings together key techniques that are widely used in Holocene research, such as radiocarbon dating, dendrochronology and sediment analysis and offers a comprehensive analysis of various archives of environmental change including instrumental and documentary records, corals, lake sediments, glaciers and ice cores. This reference will be an informative and cutting-edge resource for all researchers in the fields of climate change, environmental science, geography, palaeoecology and archaeology.

Download or read book Holocene Environmental Change in the Great Basin written by Robert Elston and published by . This book was released on 1976 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Holocene Climate Changes in the Asia Pacific Region written by Liangcheng Tan and published by Frontiers Media SA. This book was released on 2021-03-08 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Early Agriculture and Holocene Environments in the Yangtze River Delta China written by Pia Atahan and published by . This book was released on 2007 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: [Truncated abstract] Environmental changes have had major impacts on past human societies across the globe, and a better understanding of this human-environment interaction is necessary for building societies with resilience towards future environmental change, and to effectively conserve areas of natural environments into the future. Regions such as the Yangtze delta, that have a long history of rice cultivation (dating to at least ca. 7000 BP) and a high density of prehistoric sites, provide an ideal backdrop to study both long-term human-environment interactions, and the environmental impacts of agricultural societies. This study aims to provide Holocene palaeoenvironmental reconstructions for three study sites in the Yangtze delta region, with the principle objectives of detecting human activity particularly that associated with the development of rice agriculture and identifying environmental changes within the palaeoenvironmental records. A parallel aim is to develop the use of quantitative biomarker and compound specific isotope analyses in Holocene palaeoenvironmental investigations, including in the detection of early agricultural environments, through analysis of sedimentary deposits. Palaeoenvironmental records for the three study sites, Qingpu, Guangfulin and Liangzhu, cover the time period from ca. 12,000 to ca. 400 BP. '...' Greater proportions of coniferous and deciduous taxa early in the records (prior to ca. 7000 BP) indicate comparatively cooler conditions, while the increased abundance of Chenopodiaceae during that time suggests both cooler conditions and a greater marine influence in the region. Palaeoenvironmental data obtained during this study suggest agriculture in the delta region to have gradually increased in importance from ca. 7000 2400 BP. The Guangfulin study site yielded the earliest evidence of agricultural activity, dating to ca. 7000 BP, principally in the form of a corresponding increase in Poaceae (Oryza comp.) abundance and decline of arboreal forest taxa. Subsequent periods of agricultural intensification are noted at ca. 5360 BP at Liangzhu and ca. 4700 BP at Guangfulin. Following the final period of intensification at Qingpu and Guangfulin (ca. 2400 BP), the extent of cultivated land in the delta region may have been comparable to modern times. Technological development during the early dynasties, particularly the greater availability of iron tools, is likely to have been a major factor driving the agricultural intensification detected ca. 2400 BP. The large tracts of natural vegetation detected by this research prior to ca. 2400 BP, would have afforded a degree of resilience to the human inhabitants of the delta region. Following the contraction of natural vegetation in the delta region, societies would have gained some resilience through access to the extensive trade network of the Chinese state. Resilience acquired through these means may, in part, account for the longevity of agricultural societies in the Yangtze delta region of China.

Download or read book Principles of Tidal Sedimentology written by Richard A. Davis Jr. and published by Springer Science & Business Media. This book was released on 2011-10-20 with total page 622 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a comprehensive, contemporary review of tidal environments and deposits. Individual chapters, each written by world-class experts, cover the full spectrum of coastal, shallow-marine and even deep-marine settings where tidal action influences or controls sediment movement and deposition. Both siliciclastic and carbonate deposits are covered. Various chapters examine the dynamics of sediment transport by tides, and the morphodynamics of tidal systems. Several chapters explore the occurrence of tidal deposits in the stratigraphic context of entire sedimentary basins. This book is essential reading for both coastal geologists and managers, and geologists interested in extracting hydrocarbons from complex tidal successions.

Download or read book Processes and management of altered estuaries and deltas in the anthropocene written by Guan-hong Lee and published by Frontiers Media SA. This book was released on 2023-08-21 with total page 158 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Climate Changes in the Holocene written by Eustathios Chiotis and published by CRC Press. This book was released on 2018-11-15 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights climate as a complex physical, chemical, biological, and geological system, in perpetual change, under astronomical, predominantly, solar control. It has been shaped to some degree through the past glaciation cycles repeated in the last three million years. The Holocene, the current interglacial epoch which started ca. 11,700 years ago, marks the transition from the Stone Age to the unprecedented cultural evolution of our civilization. Significant climate changes have been recorded in natural archives during the Holocene, including the rapid waning of ice sheets, millennial shifting of the monsoonal fringe in the northern hemisphere, and abrupt centennial events. A typical case of severe environmental change is the greening of Sahara in the Early Holocene and the gradual desertification again since the fifth millennium before present. Climate Changes in the Holocene: Impact, Adaptation, and Resilience investigates the impact of natural climate changes on humans and civilization through case studies from various places, periods, and climates. Earth and human society are approached as a complex system, thereby emphasizing the necessity to improve adaptive capacity in view of the anthropogenic global warming and ecosystem degradation. Features: Written by distinguished experts, the book presents the fundamentals of the climate system, the unparalleled progress achieved in the last decade in the fields of intensified research for improved understanding of the carbon cycle, climate components, and their interaction. Presents the application of paleoclimatology and modeling in climate reconstruction. Examines the new era of satellite-based climate monitoring and the prospects of reduced carbon dioxide emissions.

Download or read book Monsoon Rains Great Rivers and the Development of Farming Civilisations in Asia written by Peter D. Clift and published by Cambridge University Press. This book was released on 2021-01-07 with total page 349 pages. Available in PDF, EPUB and Kindle. Book excerpt: A detailed review of climate change and its impacts on farming systems since the Neolithic, including anticipated future changes.

Download or read book New Techniques in Sediment Core Analysis written by R. G. Rothwell and published by Geological Society of London. This book was released on 2006 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this volume, recent advances in analytical and logging technology and their application to the analysis of sediment cores are presented. Developments in providing access to core data and associated datasets, and advances in data mining technology in order to integrate and interpret new and legacy datasets within the wider context of seafloor studies are also discussed.