Late quaternary sedimentary environments and landforms in the Ganges Delta

Umitsu, Masatomo

doi:10.1016/0037-0738(93)90011-s

Cited by 268 publications

(203 citation statements)

References 5 publications

Supporting

Mentioning

196

Contrasting

Order By: Relevance

“…The provenance study also indicates the presence of sediment input from the Himalaya via the river Hooghly, a distributory of the large Ganga river system, which is still active today . Similar types of mid Holocene coastal progradation are reported from other areas of the world, namely in northern Australia (Woodroffe et al 1985), in the Atralto delta in Colombia (West 1956), in the Nile delta in Egypt Warne 1993, 1994), in the Philippines (Berdin et al 2003), Indonesia (Atmadja and Soerojo 1994;Yulianto et al 2004), Bangladesh (Umitsu 1993;Islam and Tooley 1999), Puerto Rico (Lugo and Cintron 1975) and in the Mississippi delta in USA (Coleman and Roberts 1988). This suggests a world-wide phenomenon due to environmental changes caused by a combination of the factors of regional climate and local tectonics.…”

Section: Early Holocene Coastal Environment and Mangrove Dynamicssupporting

confidence: 60%

Holocene mangrove and coastal environmental changes in the western Ganga–Brahmaputra Delta, India

Hait

Behling

2008

Veget Hist Archaeobot

View full text Add to dashboard Cite

A 50 m-long radiocarbon dated core was studied through sediment and pollen analysis to reconstruct the Holocene mangrove and environmental changes at a coastal site Pakhiralaya in the Sundarban Biosphere Reserve in the western Ganga-Brahmaputra Delta, India. This biosphere reserve harbours a diverse mangrove ecosystem and supports a large number of people living in the area. Pollen and stratigraphic data indicate the existence of a brackish water estuarine mangrove swamp forest in this area during the last 9880 cal yr B.P. The development of the mangrove forest is not shown continuously in the Holocene record. Rapid transgression of the sea (9240 cal yr B.P.) halted the development of the mangrove. After about 8420 cal yr B.P. mangrove recolonised the area and persisted until 7560 cal yr B.P. as a result of a balance between the sedimentation and sea level fluctuation. The mangrove disappeared again from the site until 4800 cal yr B.P. because of a high sedimentation rate and possible delta progradation with loss of habitats. The reappearance of mangrove at the study site occurred with a return of a brackish water estuarine environment and the site then gradually became supra tidal during the mid-late Holocene. The continuity of the mangrove development and dynamics was interrupted by the fluctuating sea levels. Climatic fluctuations were viewed as an indirect factor influencing the mangrove ecosystem.

show abstract

Section: Early Holocene Coastal Environment and Mangrove Dynamicssupporting

confidence: 60%

Holocene mangrove and coastal environmental changes in the western Ganga–Brahmaputra Delta, India

Hait

Behling

2008

Veget Hist Archaeobot

View full text Add to dashboard Cite

show abstract

“…To address this short coming, Umitsu (1993) analysed data from several boreholes in the Ganges delta and the surrounding area. Radiocarbon dates were determined for a number of samples and the results used to develop palaeo-geographic maps of the delta.…”

Section: Recent Evolution Of the Bengal Basin And Its River Systemmentioning

confidence: 99%

Morphological Response of the Brahmaputra–Padma–Lower Meghna River System to the Assam Earthquake of 1950

Sarker

Thorne

2006

Braided Rivers

View full text Add to dashboard Cite

Sediment rating curves Chapter 6 Conceptual model 174 6.1 Introduction 6.2 Celerity of the disturbance in a riverbed 6.3 Changes in the Independent Variables 6.3.1 Changes in the flow regime 6.3.2 Changes in bed sediment size 6.3.3 Changes in the sediment regime 6.4 Changes in the Dependent Variables 6.4.1 Changes in bed elevation 6.4.2 Changes in width 6.4.3 Changes in braiding intensity 6.4.4 Phase lags in the observed morphological changes 65 Development of the conceptual process-response model.. 201 6.5.1 Background 201 6.5.2Adjustments in the upstream reach of the Jamuna River 202 6.5.3 Downstream reach of the

show abstract

“…Bengal delta is one of the largest deltas of the world and accommodates an enormous volume of sediments deposited during the Tertiary and Quaternary periods ). During the late Holocene period, marshy or swampy lowlands developed in several parts of the Bengal Delta Plain and formed the peat and other sediments rich in organic matter (Umitsu 1993).…”

Section: Introductionmentioning

confidence: 99%

Trend of Arsenic Pollution and Subsequent Bioaccumulation in <i>Oryza sativa</i> and <i>Corchorus capsularis</i> in Bengal Delta

Bhattacharya

Guha

Gupta³

et al. 2014

ILNS

View full text Add to dashboard Cite

Oryza sativa Linn. (rice) and Corchorus capsularis Linn. (jute) are the two major crops of the Bengal basin. Both rice and jute are generally grown in submerged flooded conditions, where arsenic bioavailability is high in soil. The consumers of the edible parts from both plants therefore face an inevitable source of exposure to arsenic, with consequent accumulation and toxicity. The objective of the study was to observe the in-vivo temporal variation of arsenic bioaccumulation in the different parts of O. sativa and C. capsularis. Rice plant specimens (Aman rice, Ratna variety) of different age groups (1, 2 and 3 months old) were analyzed in HG-AAS for absorbed arsenic content in different parts. The accumulation of arsenic remained significantly high in the initial phase of growth, but decreased with time. Amount of arsenic bioaccumulation followed the decreasing order: root > basal stem > median stem > apical stem > leaves > grains in all the three age groups of the rice plant samples. C. capsularis followed a trend of arsenic bioaccumulation similar to O. sativa. O. sativa had more accumulation potential than C. capsularis, but C. capsularis showed much higher efficiency of arsenic translocation in the above ground parts. This is the first ever report of time-dependent decrease in arsenic bioaccumulation in O. sativa and C. capsularis. The contamination level can reach the grain part in significant amount and can cause health hazards in more severely arsenic affected areas. Intensive investigation on a complete food chain is urgently needed in the arsenic contaminated zones for further risk assessments.

show abstract

Late quaternary sedimentary environments and landforms in the Ganges Delta

Cited by 268 publications

References 5 publications

Holocene mangrove and coastal environmental changes in the western Ganga–Brahmaputra Delta, India

Holocene mangrove and coastal environmental changes in the western Ganga–Brahmaputra Delta, India

Morphological Response of the Brahmaputra–Padma–Lower Meghna River System to the Assam Earthquake of 1950

Trend of Arsenic Pollution and Subsequent Bioaccumulation in <i>Oryza sativa</i> and <i>Corchorus capsularis</i> in Bengal Delta

Contact Info

Product

Resources

About