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 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 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 Evolution and Water Resources Utilization of the Yangtze River written by Jin Chen and published by Springer. This book was released on 2019-06-07 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive overview of the Yangtze River system and its water resources development and management. From the perspectives of geology, hydrology, zoology, ecology, it discusses the Yangtze River’s geological history and aquatic environments, analyses the endangered species along the river basin, and reviews the effects of human hydrolytic activities on its ecosystem. By studying the history of Yangtze River system and its water resources development, it provides insights into the effects of evolution and human activities on the ecosystem of its basin, and offers strategic thoughts on conservation and sustainable development of the Yangtze River. Written by an author with extensive experience in the field, this book is an invaluable reference resource for researchers interested in the Yangtze River.
Download or read book Geology of the China Seas written by Pinxian Wang and published by Elsevier. This book was released on 2014-06-07 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geology of the China Seas represents the first English-language synthesis of the available research into the geology of the South and East China Seas. Among the marginal basins worldwide, these areas have been the focus of extensive research activities in the last three decades, and are now among the global hot spots in hydrocarbon explorations and scientific investigations. The region is experiencing rapid economic development with the offshore petroleum industry providing approximately one third of the domestic hydrocarbon production for mainland China. Gas hydrates have been successfully recovered from the China Seas for the first time. Over the years, many volumes on the geology of the China Seas have been published in Chinese. Although an increasing number of papers in English have appeared recently, the majority deal with local or regional paleo-environment and sedimentology, and are scattered in different journals. This book brings together this rich data in one resource, particularly that generated by Chinese marine geologists and petroleum geologists, and provides the very first synthesis of the geology off China. - The first systematic summary of the geology of the China Seas - Includes comprehensive coverage of the South China Sea and the East China Sea, including the Yellow Sea and Bohai Gulf - Reviews hundreds of Chinese publications on marine and petroleum geology not currently accessible to the international community
Download or read book Optical Dating of Holocene Sediments from the Yangtze River Changjiang Delta China written by and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Holocene Delta in Western Lake Geneva and Its Palaeoenvironmental Implications written by Ira Baster and published by . This book was released on 2002 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: Des investigations sismiques et sédimentologiques ont été entreprises dans le but d'étudier l'évolution sédimentaire de la région au large de Nyon, en relation avec les processus lacustres et les changements climatiques qui ont eu lieu depuis le retrait du glacier du Rhône (18000 années BP) jusqu' à aujourd'hui. La source des sédiments a progressivement changé des eaux de fonte glaciaires aux cours d'eau locaux et un cône deltaïque, alimenté par les apports de la Promenthouse, de l'Asse et du Boiron, a commencé à se former dans la partie occidentale du Lac Léman. D'importants changements des apports sédimentaires ont eu lieu au cours de l'Holocène: six différents lobes deltaïques, progradant sur les sédiments tardiglaciaires, ont été reconnus au milieu du bassin par l'analyse séismostratigraphique. L'étude des propriétés magnétiques des séquences sédimentaires récoltées a fourni une courbe des variations séculaires du champ magnétique terrestre pour les derniers 16000 ans.
Download or read book Facies Models written by Geological Association of Canada and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sedimentologic consequences of convulsive geologic events written by Geological Society of America. Sedimentary Geology Division. Inaugural Symposium and published by Geological Society of America. This book was released on 1988 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Late Cenozoic Xianshuihe Xiaojiang Red River and Dali Fault Systems of Southwestern Sichuan and Central Yunnan China written by Erchie Wang and published by Geological Society of America. This book was released on 1998-01-01 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Ocean and Cryosphere in a Changing Climate written by Intergovernmental Panel on Climate Change (IPCC) and published by Cambridge University Press. This book was released on 2022-04-30 with total page 755 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Intergovernmental Panel on Climate Change (IPCC) is the leading international body for assessing the science related to climate change. It provides policymakers with regular assessments of the scientific basis of human-induced climate change, its impacts and future risks, and options for adaptation and mitigation. This IPCC Special Report on the Ocean and Cryosphere in a Changing Climate is the most comprehensive and up-to-date assessment of the observed and projected changes to the ocean and cryosphere and their associated impacts and risks, with a focus on resilience, risk management response options, and adaptation measures, considering both their potential and limitations. It brings together knowledge on physical and biogeochemical changes, the interplay with ecosystem changes, and the implications for human communities. It serves policymakers, decision makers, stakeholders, and all interested parties with unbiased, up-to-date, policy-relevant information. This title is also available as Open Access on Cambridge Core.
Download or read book Geological Hazards and Environmental Studies of China Offshore Areas written by Shouquan Liu and published by . This book was released on 1995 with total page 222 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 Field Trip Guidebook on Chinese Sedimentary Geology written by Xiumian Hu and published by Springer Nature. This book was released on with total page 999 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Holocene Sedimentary Record from Lake Silvana Se Brazil written by Saulo Rodrigues-Filho and published by . This book was released on 2014-01-15 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Holocene Tidal Sedimentation written by George deVries Klein and published by . This book was released on 1976 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ecological Continuum from the Changjiang Yangtze River Watersheds to the East China Sea Continental Margin written by Jing Zhang and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The book provides a cross-disciplinary and multi-scale assessment of a world top river, the Changjiang (Yangtze River) and its adjacent marginal environment, the East China Sea. The studies in this volume bridges the watersheds of the river and the marginal sea through a combined approach of hydro-dynamics, geochemistry, sedimentary processes, ecology and fishery. The response of ecosystem to the external driving forces is examined via process-oriented observations, mesocosm experiments and numerical simulations in combination. The lessons learnt from the case studies of Changjiang and East China Sea can be beneficial to those who are doing inter-disciplinary researches in the continuum from watersheds to continental margins.
