Late Pleistocene–Holocene evolution of the Doce River delta, southeastern Brazil: Implications for the understanding of wave-influenced deltas

The Simclast model has been verified and applied effectively in simulating the delta development for some major deltas in the world. In this study, we applied the model Simclast for simulating the history of the Red river delta development in late Pleistocene-Holocene. Results of the model reveal that the mainland of study area had reduced rapidly during transgression period (10,000-8,000 BP). The morphology changed significantly in the paleo-Red and Day river systems, but slightly in the paleo Thai Binh river system. The paleo-river network had been active in upper part before 11,000 BP and then shifted seaward until 2,000 BP. The river-sea interaction causes erosion and accumulation; as a result the morphology changed remarkably. The paleo-Thai Binh river had been inactive until 5,500 BP and then it was active but the morphology had not varied remarkably. The recent coastline generated from Simclast is relatively in accordance with the present coastline.

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A New and Simple Method to Capture Small Arboreal Mammals: The Suspended Pitfall

Revista Brasileira de Zoociências ◽

10.34019/2596-3325.2019.v20.24790 ◽

2019 ◽

Vol 20 (1) ◽

pp. 1-14

Author(s):

Helder José ◽

Iasmin Macedo ◽

Mateus Cruz Loss

Keyword(s):

The Other ◽

Southeastern Brazil ◽

Native Forest ◽

Simple Method ◽

Live Trap ◽

Set Up ◽

Cacao Plantation ◽

Didelphis Aurita ◽

Tree Branch ◽

Doce River

The suspended pitfall demonstrates a new and simple mechanism to capture small arboreal and scansorial mammals. It is an arboreal version of the pitfalls traditionally used to capture terrestrial amphibians and reptiles. Buckets with bait inside are raised by a rope until they reach a tree branch at the desired height. Tests were performed in the Atlantic Forest at three different sites at the mouth of Doce River in Linhares, southeastern Brazil. In one of them suspended pitfalls were set up in the understory of a shaded cacao plantation (cabruca agroforest) in the branches of cacao trees between 2 and 3 m in height, and in the other they were placed in a native forest between 5 to 15 m in height. At the third site, suspended pitfalls were tested together with the other live traps used hitherto in the understory of other cabruca agroforest. The marsupials Didelphis aurita, Caluromys philander, Marmosa (Micoureus) paraguayana, Gracilinanus microtarsus, Marmosa murina and the rodent Rhipidomys mastacalis were captured by suspended pitfall. This live trap was capable of catching all sizes of small arboreal mammals, including juvenile individuals. This method proved to be functional for the capture of some small arboreal mammals and may be a complementary alternative for sampling in high forest strata.

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Landscape evolution during the late Quaternary at the Doce River mouth, Espírito Santo State, Southeastern Brazil

Palaeogeography Palaeoclimatology Palaeoecology ◽

10.1016/j.palaeo.2013.12.001 ◽

2014 ◽

Vol 415 ◽

pp. 48-58 ◽

Cited By ~ 28

Author(s):

Marcelo Cancela Lisboa Cohen ◽

Marlon Carlos França ◽

Dilce de Fátima Rossetti ◽

Luiz Carlos Ruiz Pessenda ◽

Paulo César Fonseca Giannini ◽

...

Keyword(s):

Landscape Evolution ◽

Late Quaternary ◽

River Mouth ◽

Southeastern Brazil ◽

Espírito Santo ◽

Espirito Santo ◽

Doce River

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Late Pleistocene and Holocene bathyal ostracodes from the Santos Basin, southeastern Brazil

Palaeontographica Abteilung A ◽

10.1127/pala/285/2008/101 ◽

2008 ◽

Vol 285 (4-6) ◽

pp. 101-144 ◽

Cited By ~ 12

Author(s):

Cristianini Trescastro Bergue ◽

João Carlos Coimbra

Keyword(s):

Late Pleistocene ◽

Southeastern Brazil

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Evolutionary process of saline groundwater influenced by palaeo-seawater trapped in coastal deltas: A case study in Luanhe River Delta, China

10.5194/egusphere-egu2020-6363 ◽

2020 ◽

Author(s):

Xianzhang Dang ◽

Maosheng Gao ◽

Zhang Wen ◽

Guohua Hou

Keyword(s):

Conceptual Model ◽

Fresh Water ◽

Late Pleistocene ◽

Saline Water ◽

Shallow Groundwater ◽

Evolutionary Process ◽

Mineral Weathering ◽

River Delta ◽

Shallow Aquifer ◽

Lagoon Environment

Coastal aquifers provide fresh drinking water to over 20% of the world&#8217;s population. In recent times, they have come under immense pressure due to salinization. This study aims to investigate the origin of groundwater salinity and elucidate the major&#160;processes&#160;controlling&#160;shallow&#160;groundwater&#160;(depth of 0~50m) evolution in the Luanhe River Delta since&#160;the Holocene. Rapid increase in Electric Conductivity (EC) profile was observed in the area, as such, based on the vertical distribution of EC and&#160;sedimentary history, shallow groundwater was generalized into two zones&#160;for analysis: the groundwater&#160;in Holocene stratum (HSG) and groundwater in Late Pleistocene stratum&#160;(PSG). The isotopic (&#948;18O, &#948;2H and 14C) analyses showed that the HSG is recharged by modern surface water, while the PSG having enriched isotopic values could have been recharged during a warmer Holocene transgression period. The hydrochemistry analyses demonstrated that seawater is the major source of salinity in groundwater and overtime a series of geochemical processes (mineral weathering and/or cation exchange) modified the chemistry of the groundwater. The combined use of Cl-&#160;and &#948;18O&#160;yielded four classes of groundwater (fresh water, brackish water, saline water and brine), while the mixing phenomena between fresh water and seawater was identified to be the main evolutionary process of the shallow groundwater. To improve understanding of evolution of multiple groundwater types in a spatial context, a conceptual model was developed integrating the results derived from the presented study in a vertical cross-section. The conceptual model shows that the residual seawater mixes with freshwater from surface recharge at the shallow aquifer of the delta plain where the lagoon environment provides salinity concentration conditions for the formation of hyper-saline water. Due to&#160;the precipitation and accumulation of the salinity from hyper-saline water, some brine might form&#160;formed in late Pleistocene continental stratum.

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