Title Holocene sea-level scenarios in Bangladesh / Towhida Rashid

Published Singapore : Springer, 2014

Table of Contents
1.	Introduction					1
1.1.	Background of the Research					1
1.2.	Rationality of the Research					2
1.3.	The Study Area					4
	References					9
2.	Sea Level Research: Methods and Techniques					11
2.1.	Introduction					11
2.2.	Sea Level Changes from Geological Records					11
2.2.1.	Sea-Level Index Points					11
2.3.	Sea Level Changes from Tide Gauge Data					30
	References					31
3.	Global Sea-Level Changes Scenarios During the Holocene					35
3.1.	Introduction					35
3.2.	Different Thoughts and Scenarios of Global Sea Level Change During the Holocene					35
	References					47
4.	Landforms Development in Bangladesh					51
4.1.	Historical Evolution of Bangladesh Since Mesozoic Era					51
4.2.	Delta Formation and Landform Development in Response to Sea Level Changes During Quaternary Period					53
4.2.1.	Early Development: 18000--7000 cal year BP					53
4.2.2.	Late Development: 7000 cal year BP to Present					56
4.2.3.	Physiographic Regions in Bangladesh					57
	References					59
5.	Sea Level Changes Scenarios During Holocene in Bangladesh					61
5.1.	Phase 1 (Approximately 7500 years BP)					61
5.2.	Phase 2 (at Approximately 6500 years BP)					64
5.3.	Phase 3 (Approximately 6000 years BP)					64
5.4.	Phase 4 (Between Approximately 5500 and 5000 years BP)					65
5.5.	Phase 5 (Between Approximately 5000 and 1500 years BP)					66
5.6.	Paleo-Coastline of Bangladesh During Early to Middle Holocene					67
	References					69
6.	Discussions and Conclusion					71
6.1.	Recent Pattern and Future Projection of Sea Level Change in the World with Reference to Bangladesh					74
	References					76

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Description 1 online resource : illustrations, maps Series Springer briefs in oceanography SpringerBriefs in oceanography. Contents Introduction -- Sea level study: Methods and techniques -- Global Sea-level scenarios during the Holocene -- Landforms development in Bangladesh -- Holocene Sea-level Changes in Bangladesh -- Discussion and Conclusion Summary This Brief deals with the reconstruction of Holocene paleoenvironment in the central part of Bangladesh in relation to relative sea-level (RSL) changes which is 200 km north from the present coastline. Lithofacies characteristics, mangal peat, diatom and paleophysiographical evidences were considered to reconstruct the past position and C-14 ages were used to determine the time of formation of the relative sea-level during the Holocene. With standard reference datum the required m.s.l. at the surface of five sections are calculate and the RSL curve suggests that Bangladesh has experienced two mid Holocene RSL transgressions punctuated by regressions. The abundant marine diatom and mangrove pollens indicates that the highest RSL transgression in Bangladesh is around 6000 cal BP which is attained at least 4.5 to 5m higher than the modern m.s.l. After this phase, the relative sea-level started to fall and consequently a freshwater peat developed around 5980--5700 cal BP. The abundant mangrove pollens in salt-marsh succession shows the regression around 5500 cal BP and, the height was 1--2 m higher than the modern sea level. These and more interesting findings are discussed in this Brief Bibliography Includes bibliographical references Subject Sea level -- Bengal, Bay of -- History Shorelines -- Bangladesh -- History Geography -- Bangladesh Geology -- Bangladesh SCIENCE / Earth Sciences / General Sciences de la terre. Environnement. Geography Geology Sea level Shorelines Bangladesh Bay of Bengal Genre/Form History Form Electronic book ISBN 9789814560993 (electronic bk.) 9814560995 (electronic bk.) 9814560987 9789814560986

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