Holocene environmental changes of the Godavari Delta, east coast of India, inferred from sediment core analyses and AMS 14C dating

Rao, K. Nageswara; Saito, Yoshiki; Nagakumar, K.Ch.V.; Demudu, G.; Basavaiah, N.; Rajawat, A. S.; Tokanai, Fuyuki; Kato, Kazuhiro; Nakashima, Rei

doi:10.1016/j.geomorph.2012.07.007

Cited by 12 publications

(5 citation statements)

References 40 publications

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“…The present-day mangroves in the Machilipatnam core sight are connected to the back waters flooded from the Kanuru sight in low-lying areas. The adjacent Goguleru creek is also reported to be under subsidence, and therefore, the sea water ingression is observed in most part of inter-deltaic areas of K-G River (Nageswara Rao et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

“…The Chintalapudi and Krishna Cross Trend faults of the basement extend offshore. The formation of Goguleru creek (north of Kanuru), is the low-lying portions of the palaeo beach swales filled by ingressing sea water and in between islands are the beach ridges (Nageswara Rao et al, 2012). Similar beach ridges and swales are also observed in Kanuru site, and the dominance of mangroves (similar height), here, suggests the tectonically controlled recent ingression of sea water.…”

Section: Discussionmentioning

confidence: 99%

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Deltaic land subsidence and sea level fluctuations along the east coast of India since 8 ka: A palynological study

Farooqui¹,

Ranjana²,

Nautiyal³

2016

The Holocene

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The consequences of climate change and land subsidence are often related to sea level rise/fall. Mangrove extinction and migration were assessed through palynological studies in two sedimentary cores in order to address climate, Relative Sea level (RSL) and its relation to geomorphology since 8420 cal. yr BP from Kanuru (500 cm deep) and since 5850 cal. yr BP from Machilipatnam (118 cm deep), Krishna delta, India. Four units/nine phases of sediment depositional environment were identified on the basis of marine/terrestrial palynomorphs. In Unit 1, the marine palynomorphs indicate palaeoshoreline in Kanuru from 8420 to 8300 cal. yr BP which is now ~4–5 km from the present-day shoreline, but after a short span a retreat in sea level took place between 8300 and 7040 cal. yr BP. About three to four short-term intermittent rise/fall in RSL were recorded in Unit 2 between 7040 and 3980 cal. yr BP in Kanuru and between 5225 and 3240 cal. yr BP in Machilipatnam. During this period, the diversity of mangroves was more in Machilipatnam and only salt-tolerant mangroves were present in Kanuru. Unit 3 is characterized by non-estuarine sediment deposition since 3920–240 cal. yr BP in Kanuru and since 3240–950 cal. yr BP in Machilipatnam. Unit 4 shows a rise in RSL in both the studied sites which began much earlier in Machilipatnam than in Kanuru. Loss of mangrove diversity and dominance of salt-tolerant mangroves were recorded in Unit 4. Results indicate climate-induced RSL fluctuations highlighting the cooling event of 8.2 ka BP from Kanuru site and duration of intermittent rise/fall of RSL during middle Holocene transgression. The rate of sea level rise during the period was not continuous but interrupted by three to four retreats. At present, the evidence of these are at different depths in both the sites and in other contemporary sites along the east coast of India, suggesting neo-tectonics in the vertical stack of Holocene sediment. The geomorphology of the studied sector is tectonically controlled which may increase deltaic instability in future.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Deltaic land subsidence and sea level fluctuations along the east coast of India since 8 ka: A palynological study

Farooqui¹,

Ranjana²,

Nautiyal³

2016

The Holocene

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“…To obtain such information, accurate and reliable chronology is of crucial importance. Radiocarbon dating (e.g., Hori et al, 2001;Nageswara Rao et al, 2012;Xu et al, 2019) and luminescence dating (e.g., Shen and Mauz, 2012;Sugisaki et al, 2015;Nian et al, 2018;Wang F. et al, 2018;Wang Z. H. et al, 2018;Wang et al, 2019) have been widely used for dating the Holocene deltaic sediments.…”

Section: Introductionmentioning

confidence: 99%

Chronology of a Holocene Core From the Pearl River Delta in Southern China

Xu¹,

Li²,

Tang³

et al. 2020

Front. Earth Sci.

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Establishing a reliable chronological framework for sediments is crucial to the reconstruction of evolution process of estuarine delta, and the study of regional paleoenvironmental history, e.g., sea level fluctuations due to global climatic changes. High resolution chronology is still very limited for Holocene sediments in the Pearl River delta (PRD) in southern China. This study tries to construct a detailed chronology for core DA of 37.7 m in depth by using luminescence (seven samples) and radiocarbon (fourteen samples) dating techniques. Our results indicate that both luminescence and radiocarbon dating methods are suitable for the Holocene sediments in the PRD and that sediments of core DA were deposited during 7.3-0.18 ka. The 14 C age is generally older than the OSL age for the sediment at the similar depths, and the age difference increased from 0.45 ka at the depth of 21 m to 0.98 ka at the depth of 35 m. The reason that 14 C ages are relatively older might be caused by the carbon-reservoir effect which requires further study. The sedimentation rate increased from 3.74 m/ka during 7.3-2 ka to 7.92 m/ka in the last 2 ka. The appearances of rusty stains in upper unit of the core revealed that the water level was gradually falling. After the formation of underwater sand body at about 2 ka, the sediment was subject to continuous shifting between submergence and exposure.

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“…This densely populated delta sustains an average population density of 729 persons per km 2 [11]despite receiving an average annual rainfall of 1100 mm [10] in this semiarid region. The robust monsoon period from June to November brings cyclones, resulting in a high-energy wave environment and storm surges measuring 3 to 4 meters in the bay [12].…”

Section: Study Areamentioning

confidence: 99%

Examining Coastal Alterations in the Godavari Delta Region using DSAS, Remote Sensing and GIS Techniques

Tharapatla,

Kinthada,

Gurram

2024

J. Phys.: Conf. Ser.

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This research focuses on the Godavari delta coastline, extending from Upputeru Creek to Uppada Village in Andhra Pradesh, India. Spanning from 1977 to 2023, the study meticulously examines multi-temporal remote sensing datasets from 1977, 1988, 1992, 2001, 2016, and 2023. To establish an accurate shoreline configuration, this study employs image processing techniques leveraging algorithms such as the Land Surface Water Index (LSWI) and the Normalized Difference Vegetation Index (NDVI). For computing erosion and accretion rates within the GIS environment, the Digital Shoreline Analysis System (DSAS) is utilized, employing 100-meter transect intervals and techniques including Linear Regression Rate (LRR), Endpoint Rate (EPR), and Weighted Linear Regression (WLR). The analysis delineates distinct zones in the Godavari delta coastal region, classifying them into areas of high erosion, low erosion, stable coastlines, and varying degrees of accretion. Significant erosion is identified in regions from the left bank of Vashista to Parupalem Beach and between the Vainateya River Mouth and Gowthami River Mouth. Meanwhile, areas of low erosion extend from the right bank of Vashista River Mouth to Anthervedi Beach, with stable coastlines identified from Kakinada to Uppada Beach and Upputeru Creek to Perrupalem Beach. Additionally, the study pinpoints high accretion along Kakinada Spit and relatively lower accretion along other shoreline segments. This comprehensive assessment yields critical insights into erosion and accretion dynamics, laying a foundation for informed coastal management strategies in the Godavari delta region.

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Holocene environmental changes of the Godavari Delta, east coast of India, inferred from sediment core analyses and AMS 14C dating

Cited by 12 publications

References 40 publications

Deltaic land subsidence and sea level fluctuations along the east coast of India since 8 ka: A palynological study

Deltaic land subsidence and sea level fluctuations along the east coast of India since 8 ka: A palynological study

Chronology of a Holocene Core From the Pearl River Delta in Southern China

Examining Coastal Alterations in the Godavari Delta Region using DSAS, Remote Sensing and GIS Techniques

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