Palaeogeography and evolution of the Godavari delta, east coast of India during the Holocene: An example of wave-dominated and fan-delta settings

Rao, K. Nageswara; Saito, Yoshiki; Nagakumar, K.Ch.V.; Demudu, G.; Rajawat, A. S.; Kubo, S.; Li, Zhen

doi:10.1016/j.palaeo.2015.09.006

Cited by 50 publications

(24 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The climate in the Danube catchment is diverse, with an oceanic influence on the western part of the upper basin, a Mediterranean influence in the south and central part of the middle basin, and a continental climate influence in the other parts. The annual precipitation varies from 2000 mm yr −1 in the mountain area to 500 mm yr −1 in the plains (Rimbu et al, 2002).…”

Section: Danube and Black Seamentioning

confidence: 99%

Long-chain diols in rivers: distribution and potential biological sources

et al. 2018

View full text Add to dashboard Cite

Abstract. Long-chain diols (LCDs) occur widespread in marine environments and also in lakes and rivers. Transport of LCDs from rivers may impact the distribution of LCDs in coastal environments, however relatively little is known about the distribution and biological sources of LCDs in river systems. In this study, we investigated the distribution of LCDs in suspended particulate matter (SPM) of three river systems (Godavari, Danube, and Rhine) in relation with precipitation, temperature, and source catchments. The dominant long-chain diol is the C32 1,15-diol followed by the C30 1,15-diol in all studied river systems. In regions influenced by marine waters, such as delta systems, the fractional abundance of the C30 1,15-diol is substantially higher than in the river itself, suggesting different LCD producers in marine and freshwater environments. A change in the LCD distribution along the downstream transects of the rivers studied was not observed. However, an effect of river flow is observed; i.e., the concentration of the C32 1,15-diol is higher in stagnant waters such as reservoirs and during seasons with river low stands. A seasonal change in the LCD distribution was observed in the Rhine, likely due to a change in the producers. Eukaryotic diversity analysis by 18S rRNA gene sequencing of SPM from the Rhine showed extremely low abundances of sequences (i.e., < 0.32 % of total reads) related to known algal LCD producers. Furthermore, incubation of the river water with 13C-labeled bicarbonate did not result in 13C incorporation into LCDs. This indicates that the LCDs present are mainly of fossil origin in the fast-flowing part of the Rhine. Overall, our results suggest that the LCD producers in rivers predominantly reside in lakes or side ponds that are part of the river system.

show abstract

Section: Danube and Black Seamentioning

confidence: 99%

Long-chain diols in rivers: distribution and potential biological sources

et al. 2018

View full text Add to dashboard Cite

show abstract

“…The Godavari Delta developed during ~6 cal. ka BP through six stages (lobes 1–6; Figure 1c) of successive migration of the main depocenter (Nageswara Rao et al, 2015); the corresponding time intervals of each lobe are shown in Figure 2. The sediment accumulation rate in the delta had progressively increased from as low as ~12 Mt/yr during 6–4 cal.…”

Section: Study Areamentioning

confidence: 99%

“…(b) Distribution of the ecological communities in the Godavari drainage basin (after Zorzi et al, 2015). (c) SRTM 90 m DEM showing the Godavari delta with the six delta growth lobes outlined (after Nageswara Rao et al, 2015). The red circle indicates the location of core CY.…”

Section: Introductionmentioning

confidence: 99%

“…We then presented a continuous high-resolution record of vegetation, sediment source and erosion vis-à-vis the monsoon decline and human activity for the period from 6.1 to 1.3 cal. ka BP, taking advantage of the high sedimentation rate and high sensitivity of proxies to the monsoon climate and sediment sources in sediment core CY from the Godavari Delta, India (Nageswara Rao et al, 2015). Our study will not only unravel the linkage between climate and human society but also reveal the ecosystem sensitivity in a semi-arid climate setting.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A mid- to late-Holocene record of vegetation decline and erosion triggered by monsoon weakening and human adaptations in the south-east Indian Peninsula

et al. 2017

Self Cite

View full text Add to dashboard Cite

The mid- to late-Holocene monsoon decline led to aridification of the Indian Peninsula impacting the early agricultural practices in the region. Our analysis of organic carbon, mineral magnetic properties and AMS 14C dating of a 54.2-m-long sediment core (CY) from the Godavari Delta, India, showed changes in the organic carbon source and sediment provenance, which are linked to the changes in vegetation and soil/rock erosion caused by widespread aridification and associated human adaptation in central India. Our results show a decline in the concentration of ferrimagnetic minerals, indicating reduced input from the basalts of the Deccan Plateau after ~6.0 cal. ka BP in response to the weaker Indian monsoon. δ13C values show a distinct increase from ~4.9 cal. ka BP, indicating an increase in C4 plant sources under the continued weak monsoon phase, whereas a higher ferrimagnetic mineral concentration in the sediment suggested an increased Deccan basalt source. Abrupt increase in δ13C values and decrease in TOC content accompanied with a significant increase in ferrimagnetic mineral concentration from ~3.2 to 3.1 cal. ka BP reflected a shift of organic carbon and sediment source and a severe decline in vegetation coverage. Such phenomena indicate intensified deforestation and soil/rock erosion in the Deccan Plateau producing higher ferrimagnetic mineral inputs, which is in agreement with significant expansion of agricultural activities in the Deccan Chalcolithic cultural period. In addition, C3 plants recovered and magnetic concentration declined during the wet events (4.6 and 4.0 cal. ka BP) of Neolithic time, while both C3 plants and magnetic parameters increased during the wet events (3.1–2.8 and 2.1 cal. ka BP) of the Chalcolithic cultural period. This implies increased agricultural activity and the onset of human modification of the ecosystem.

show abstract

“…Using published works, we first compile the monthly sediment discharge of each river considered in this study (Supplementary Fig. 2 and Supplementary Table 1 ): Amazon 34 , Ganges-Brahmaputra 35 , Changjiang 36 , Irrawaddy 37 , Indus 38 , Huanghe 39 , 40 , Magdalena 32 , Godavari 41 , Fly 42 , 43 , Orinoco 44 , Mekong 45 , 46 , Mississippi 47 , Congo 44 . Temporal variability in sediment export (monthly relative fraction) is required for the sediment advection model (described in the next paragraph) to model the fraction of the total yearly sediment discharge that is exported each month.…”

Section: Methodsmentioning

confidence: 99%

Assessing modern river sediment discharge to the ocean using satellite gravimetry

et al. 2018

View full text Add to dashboard Cite

Recent acceleration of sand extraction for anthropic use threatens the sustainability of this major resource. However, continental erosion and river transport, which produce sand and sediment in general, lack quantification at the global scale. Here, we develop a new geodetic method to infer the sediment discharge to ocean of the world’s largest rivers. It combines the spatial distribution of modern sedimentation zones with new high-resolution (~170 km) data from the Gravity Recovery and Climate Experiment (GRACE) mission launched in 2002. We obtain sediment discharges consistent with in situ measurements for the Amazon, Ganges-Brahmaputra, Changjiang, Indus, and Magdalena rivers. This new approach enables to quantitatively monitor the contemporary erosion of continental basins drained by rivers with large sediment discharges and paves the way toward a better understanding of how natural and anthropic changes influence landscape dynamics.

show abstract

Palaeogeography and evolution of the Godavari delta, east coast of India during the Holocene: An example of wave-dominated and fan-delta settings

Cited by 50 publications

References 43 publications

Long-chain diols in rivers: distribution and potential biological sources

Long-chain diols in rivers: distribution and potential biological sources

A mid- to late-Holocene record of vegetation decline and erosion triggered by monsoon weakening and human adaptations in the south-east Indian Peninsula

Assessing modern river sediment discharge to the ocean using satellite gravimetry

Contact Info

Product

Resources

About