Acoustical facies analysis at the Ba Lat delta front (Red River Delta, North Vietnam)

Bergh, Gerrit D. van den; Weering, Tj.C.E. van; Boels, Jelle F.; Duc, Do Minh; Nhuận, Mai Trọng

doi:10.1016/j.jseaes.2006.03.005

Cited by 24 publications

(12 citation statements)

References 17 publications

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“…The average and maximum wave heights are 0.7–1.3 m and 3.5–4.5 m, respectively [ Duc et al ., ]. Geomorphologically, the subaqueous delta can be divided into an erosional shoreface zone (water depth <5 m), a delta front at the Ba Lat mouth, and a prodelta zone (5–30 m) [ van den Bergh et al ., ]. Sand is dominant in the shoreface zone due to the stronger hydrodynamics, and silts are dominant in the delta front and clayey silts in the prodelta zone [ Duc et al ., ].…”

Section: Study Areamentioning

confidence: 99%

Magnetic properties of sediments of the Red River: Effect of sorting on the source‐to‐sink pathway and its implications for environmental reconstruction

Nguyen

Zhang

et al. 2016

Geochem Geophys Geosyst

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We conducted a mineral magnetic study of river bank and subaqueous delta sediments from the Red River, in order to examine the role of sedimentary sorting on the variation of sedimentary magnetic properties from source to sink. The magnetic mineralogy mainly consists of magnetite and hematite. Bulk sediment particle‐size variations have a strong influence on magnetic properties, with the frequently used magnetic parameters χfd%, χARM, χARM/χ, and χARM/SIRM exhibiting positive correlations with the <4 µm fraction, while S‐ratios are negatively correlated with this fraction. Compared with river bank sediments and shallow shoreface (<5 m water depth) sediments, sediments from the deeper (>5 m water depth) part of the subaqueous delta have lower χ and SIRM values, a finer ferrimagnetic grain‐size and higher proportions of hematite, consistent with selective loss of coarse ferrimagnetic grains on the source‐to‐sink pathway. We suggest that variations in magnetic properties in response to particle‐size compositions and therefore depositional environment changes should be carefully addressed when magnetic proxies such as χARM/SIRM are used in the study of coastal and marine environmental changes (e.g., sea‐level change). In such cases, the combined use of magnetic properties and geochemical indicators, such as Al/Ti ratio, may provide better results for paleoenvironmental reconstruction.

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Section: Study Areamentioning

confidence: 99%

Magnetic properties of sediments of the Red River: Effect of sorting on the source‐to‐sink pathway and its implications for environmental reconstruction

Nguyen

Zhang

et al. 2016

Geochem Geophys Geosyst

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“…Based on the acoustic study carried out by van den Bergh et al (2006), a morphogenetic subdivision of the study area was made (Fig. 1B).…”

Section: Delta Settingmentioning

confidence: 99%

“…The Northern Prodelta is also detached from the coast by a 2-3 km wide erosional shoreface. van den Bergh et al (2006). Also shown are the positions of bottom sampling stations.…”

Section: Delta Settingmentioning

confidence: 99%

“…The large thickness of the youngest acoustic unit (Unit Z1) in the area southwest of the river mouth (see Fig. 6 in van den Bergh et al, 2006) suggests that after settling, bottom transport redirects a large amount of sediment in southwestern direction. This is again conWrmed by the relatively high accumulation rate at station 15 (3.2-4.5 cm yr ¡1 ).…”

Section: Spatial Accumulation Patternsmentioning

confidence: 99%

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Recent sedimentation and sediment accumulation rates of the Ba Lat prodelta (Red River, Vietnam)

Bergh

Boer

Schaapveld³

et al. 2007

Journal of Asian Earth Sciences

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“…From a dynamics perspective, Maren [9,10] analyzed the response of the downstream estuary and coast to the sediment transporting condition in the upper stream. Bergh [11] deduced sediment changing and analyzed the driving factors through measuring the submarine sediment properties in the delta by the method of the acoustical measurement.…”

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confidence: 99%

Sediment change under climate changes and human activities in the Yuanjiang-Red River Basin

Ren

et al. 2007

Chin. Sci. Bull.

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Both the climate change and human activities are the major influence factors to the sediment change in mountainous rivers. Based on the over 40 years' record, suspended sediment loads (SSL) change at the Manhao gauging station in the lower reaches of Yuanjiang River (upper Red River). In this paper, the variation of the sediment and its drivers were analyzed through different methods such as synchronous data comparison, traditional correlation, linear regression, and Granger causality. The results show that (1) the general trend of the annual average sediment concentration (SSC) and SSL at Manhao station is increasing from the 1960s to the 1990s, and there is a quick change period after 1984; (2) the SSL and SSC at Manhao station, during different periods of the 1960s, 1970s, 1980s and 1990s, are 1.87, 2.49, 3.12, 3.63 kg/m 3 , and 28.7×10 6 , 40.3×10 6 , 44.1×10 6 , 60.3×10 6 t/a, respectively; (3) the correlation analysis and the Granger causality test proved that the climate changes in the catchment were the main driving factors to the sediment variation in the period of 1960s and 1990s, but the influence by the mountainous human actions on the sediment change is stronger than that by the local climate changes in the 1970s and 1980s; (4) the correlation between the sediment changes and the forest coverage change is negative, which further proves that the sediment changes are strongly affected by the human activities in the basin. sediment change, Granger causality test, Yuanjiang River, the Longitudinal Range-Gorge Region

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Acoustical facies analysis at the Ba Lat delta front (Red River Delta, North Vietnam)

Cited by 24 publications

References 17 publications

Magnetic properties of sediments of the Red River: Effect of sorting on the source‐to‐sink pathway and its implications for environmental reconstruction

Magnetic properties of sediments of the Red River: Effect of sorting on the source‐to‐sink pathway and its implications for environmental reconstruction

Recent sedimentation and sediment accumulation rates of the Ba Lat prodelta (Red River, Vietnam)

Sediment change under climate changes and human activities in the Yuanjiang-Red River Basin

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