Surface water types and sediment distribution patterns at the confluence of mega rivers: The Solimões-Amazon and Negro Rivers junction

2015 ◽  
Vol 51 (8) ◽  
pp. 6197-6213 ◽  
Author(s):  
Edward Park ◽  
Edgardo M. Latrubesse
Keyword(s):  
Surface Water ◽  
Distribution Patterns ◽  
Sediment Distribution ◽  
Water Types

FAULT CONTROLS ON SEDIMENT DISTRIBUTION PATTERNS, LIMÓN BASIN, COSTA RICA

2007 ◽  
Vol 30 (1) ◽  
pp. 25-40 ◽  
Author(s):  
C. Brandes ◽  
A. Astorga ◽  
S. Back ◽  
R. Littke ◽  
J. Winsemann
Keyword(s):  
Costa Rica ◽  
Distribution Patterns ◽  
Sediment Distribution

A SEQUENCE STRATIGRAPHIC STUDY OF THE CALLOVIAN FLUVIO-DELTAIC TO MARINE SUCCESSION WITHIN THE ZOCA REGION

1996 ◽  
Vol 36 (1) ◽  
pp. 269 ◽  
Author(s):  
P.A. Arditto
Keyword(s):  
Coastal Plain ◽  
Distribution Patterns ◽  
Zone Boundary ◽  
Third Order ◽  
Sediment Distribution ◽  
Sequence Stratigraphic ◽  
Modern Analogue ◽  
Delta System ◽  
Order Sequence ◽  
Reference Section

This paper presents the results and conclusions of an integrated sequence stratigraphic study of the Callovian marine succession across area 'A' of the Zone of Cooperation (ZOCA). This study utilised wireline log and conventional core data from within ZOCA 91–1 and ZOCA 91–12, and incorporated trade data from adjacent permits, to generate a rational depositional model for the succession. Three distinct third-order sequences have been recognised from the detailed correlation of regional flooding surfaces recognised on wireline log motifs calibrated against conventional core and biostratigraphy. The base of the oldest third-order sequence includes section previously referred to as Plover Formation, and roughly corresponds to the W.digitata/W.indotata zone boundary. The Callovian Unconformity within the ZOCA region is thus relegated to a third-order sequence boundary or disconformity. The term Elang Formation is proposed for this Callovian succession which comprises three third-order sequences mappable across ZOCA. The well-type section for the Elang Formation is Elang-1, and an additional well reference section would be Elang-2, as both these wells contain significant and complementary cored section.Detailed sedimentological studies on conventional core reveal that the Elang Formation comprises a succession of coastal plain to nearshore marine sediments, ranging from low sinuosity fluvial channel, fluvial-dominated deltaic, proximal low sinuosity estuarine channel and distal outer bay sediments. Only minor wave-dominated, open marine shoref ace intervals were interpreted, most of the cored intervals indicating a fluvially-domi-nated shoreline with minimal wave reworking. Isopach and per cent sand maps generated for each third-order sequence comprising the Elang Formation illustrate the successive sediment distribution patterns across ZOCA during the progressive marine transgression from the top of the fluvio-deltaic Plover Formation to the base of the offshore marine Lower Flamingo Group. The sand-trend maps for the three sequences which comprise the Elang Formation indicate a fluvial/estuarine-dominated delta system, sourced from the region of the Laminaria Field, AC/P8, building east and southeast out across the ZOCA region. A modern analogue of this delta system in both size and sedimentation style may be the Brahmaputra/Ganges Delta of East Bengal.

The Intermediate Depth Waters of the Tasman and Coral Seas. I. The 27.20 σt Surface

1960 ◽  
Vol 11 (2) ◽  
pp. 127 ◽  
Author(s):  
DJ Rochford
Keyword(s):  
Dissolved Oxygen ◽  
Distribution Patterns ◽  
Equatorial Region ◽  
Intermediate Depth ◽  
Water Types ◽  
South West ◽  
The Pacific ◽  
Antarctic Convergence ◽  
Horizontal Mixing ◽  
The Antarctic

The distribution of salinity, dissolved oxygen, and phosphates on the 27.20 σt surface of the Tasman and Coral Seas is examined. Their distribution patterns and the relations of salinity and phosphate values on this σt surface are explained by the horizontal mixing of three water types. These originate, one at the Antarctic Convergence, one in the western equatorial region of the Pacific, and one in the south-west Pacific. From the distribution of these water types and the topography of the 27.20 σt surface, general features of the intermediate depth circulation of the Tasman and Coral Seas are deduced.

scholarly journals Sedimentological evidence for seiching in a swell-dominated headland-bay system: Table Bay, Western Cape, South Africa

2021 ◽  
Vol 41 (4) ◽  
Author(s):  
Mike Woodborne ◽  
Burg Flemming
Keyword(s):  
South Africa ◽  
Standing Wave ◽  
Large Scale ◽  
Logarithmic Spiral ◽  
Distribution Patterns ◽  
Western Cape ◽  
Sediment Distribution ◽  
Maximum Period ◽  
Hydrodynamic Processes ◽  
Robben Island

AbstractTable Bay, South Africa, is a typical headland-bay system with a shoreline that can be described by a logarithmic spiral. A peculiarity and unique feature of Table Bay is the juxtaposition of Robben Island opposite its headland. As a consequence, the bathymetry defines an ellipsoidal basin which was postulated to potentially resonate in the form of long-period standing waves (seiches). One aim of this study, therefore, was to investigate whether any evidence for such resonant oscillations could be detected in the geomorphology and sediment distribution patterns. Indeed, the ellipsoidal shape of the basin can be framed by two converging log-spirals with their centres located opposite each other, one off Robben Island and the other on the Cape Town side of the bay. The so-called apex line, which divides the two spirals into equal parts is aligned SW–NE, i.e. more or less parallel to the direction of ocean wave propagation. The distribution patterns of all sedimentary parameters were found to be characterised by a strikingly similar trend to either side of the apex line. This supports the hypothesis that the basin of Table Bay appears to resonate in the form of a mode 1 standing wave, with the node positioned above the apex line in the centre of the bay. The maximum period of such a standing wave was calculated to be around 37 min. The study demonstrates that large-scale sediment distribution patterns can reveal the existence of specific hydrodynamic processes in coastal embayments. It is recommended that this phenomenon be investigated in greater detail aimed at verifying the existence of resonant oscillations in Table Bay and, in the event, at establishing its precise nature and trigger mechanism.

scholarly journals GRAIN-SIZE STATISTICAL PARAMETERS OF SANDY SEDIMENT IN KUALA GIGIENG, ACEH BESAR DISTRICT

2015 ◽  
Vol 7 (1) ◽  
Author(s):  
Syahrul Purnawan ◽  
Haekal A. Haridhi ◽  
Ichsan Setiawan ◽  
. Marwantim
Keyword(s):  
Grain Size ◽  
Sediment Load ◽  
Distribution Patterns ◽  
Sandy Sediment ◽  
Size Distributions ◽  
Statistical Parameters ◽  
Sediment Distribution ◽  
Coarse Grains ◽  
Load Transport ◽  
Grain Size Distributions

Study of sediment distribution at Kuala Gigieng was to assess the information of sediment related to the occurrence of hydro-oceanographic processes. The sediment samples were collected from nine stations using coring method. Granulometric method was used to analyze the grain size distributions. The results showed different sediment distribution patterns in each area at estuary Kuala Gigieng. The outer area of estuary indicated skewed to coarse grains, while at the inner area of estuary indicated skewed to fine grains. Different sediment load transport process was suggested as the cause of differentiated sediment characters.   Keywords: granulometry, grain size, sediment statistic, Kuala Gigieng

scholarly journals GRAIN-SIZE STATISTICAL PARAMETERS OF SANDY SEDIMENT IN KUALA GIGIENG, ACEH BESAR DISTRICT

2015 ◽  
Vol 7 (1) ◽  
Author(s):  
Syahrul Purnawan ◽  
Haekal A. Haridhi ◽  
Ichsan Setiawan ◽  
. Marwantim
Keyword(s):  
Grain Size ◽  
Sediment Load ◽  
Distribution Patterns ◽  
Sandy Sediment ◽  
Size Distributions ◽  
Statistical Parameters ◽  
Sediment Distribution ◽  
Coarse Grains ◽  
Load Transport ◽  
Grain Size Distributions

<p><em>Study of sediment distribution at Kuala Gig</em><em>i</em><em>eng was to assess the information of sediment related to the occurrence of</em><em> </em><em>hydro-oceanographic processes. The sediment samples were collected from nine stations using coring method. Granulometri</em><em>c</em><em> method was used to analyze the grain size distributions. The results showed different sediment distribution patterns in each area at estuary Kuala Gig</em><em>i</em><em>eng. The outer area of estuary indicated skewed to coarse grains, while at the inner area of estuary indicat</em><em>e</em><em>d skewed to fine grains. Different sediment load transport process was suggested as the cause of differentiate</em><em>d</em><em> sediment characters.</em><em> </em></p> <p> </p> <strong><em>Keywords: </em></strong><em>granulometry, grain size, sediment statistic, Kuala Gigieng</em>

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