scholarly journals KONTRIBUSI PENTARIKHAN RADIOKARBON PERCONTOH TERUMBU KARANG PADA BATUGAMPING DI PANTAI SELATAN KABUPATEN WONOGIRI, JAWA TENGAH, TERHADAP NEOTEKTONIK KUARTER

2016 ◽  
Vol 6 (2) ◽  
Author(s):  
Prijantono Astjario ◽  
D.A. Siregar
Keyword(s):  
Coral Reef ◽  
Sea Level ◽  
Coastal Zone ◽  
Radiocarbon Dating ◽  
Tectonic Activity ◽  
Southern Coast ◽  
Uplift Rate ◽  
Mean Sea Level ◽  
Central Java ◽  
Active Tectonic

Wilayah pantai Ngungap, kawasan pesisir selatan Wonogiri, Jawa Tengah merupakan daerah jalur anjak dimana terumbu karang Kuarter tersingkap dari garis pantai hingga pebukitan tinggi. Enam undak laut terbentuk sejajar dengan garis pantai hingga mencapai ketinggian lebih dari 300 meter di atas muka laut. Hasil pentarikhan Radiokarbon tiga fosil terumbu karang dari undak laut termuda yang dapat berkontribusi terhadap perhitungan proses pengangkatan kawasan pantai Ngungap. Undak laut termuda menunjukan bahwa rata-rata aktivitas tektonik pengangkatan diwilayah pantai Ngungap, kawasan pesisir selatan Wonogiri adalah 5 mm/tahun. Pengangkatan rata-rata pesisir selatan Wonogiri jauh berbeda dengan kecepatan kawasan pantai-pantai tektonik aktif lainnya di Indonesia. Kata kunci : anjak, terumbu karang, undak laut, pentarikhan, pantai Ngungap Jawa Tengah The Ngungap coast of the southern coastal zone of Wonogiri, Central Jawa, situated in the central portion of the arcuate thrustbelt where Quaternary reefs show maximal elevation from coastline up to high hinterland. Six terraces have been formed parallel to the coast line and extensively exposed up to more than 300 meters above mean sea level. Three Radiocarbon dating of coral reef derived from the lowest terraces can be contributed to the uplift calculation in the Ngungap area. The lowest terrace alows uplifting tectonic activity in the coast of Ngungap in the order of 5 mm/years. The uplift rate of southern coast of Wonogiri is different to the rate of active tectonic coastal areas in the eastern Indonesian region. Keywords: thrustbelt, reef, terrace, dating, Ngungap coast of Central Java

Hydrodynamic response of a fringing coral reef to a rise in mean sea level

2014 ◽  
Vol 64 (7) ◽  
pp. 975-987 ◽  
Author(s):  
Soheila Taebi ◽  
Charitha Pattiaratchi
Keyword(s):  
Coral Reef ◽  
Sea Level ◽  
Mean Sea Level ◽  
Hydrodynamic Response

The mid-Holocene sea-level highstand at Bogenfels Pan on the southwest coast of Namibia

2006 ◽  
Vol 66 (2) ◽  
pp. 303-310 ◽  
Author(s):  
John S. Compton
Keyword(s):  
Sea Level ◽  
Southern Africa ◽  
Before Present ◽  
Southern Coast ◽  
Mollusc Shell ◽  
Mean Sea Level ◽  
The Holocene ◽  
Longshore Drift ◽  
Rapid Emergence ◽  
Holocene Sea Level

AbstractThe radiocarbon ages of mollusc shells from the Bogenfels Pan on the hyper arid southern coast of Namibia provide constraints on the Holocene evolution of sea level and in particular, the mid-Holocene highstand. The Bogenfels Pan was flooded to depths of 3 m above mean sea level (amsl) to form a large subtidal lagoon from 7300 to 6500 calibrated radiocarbon years before present (cal yr BP). The mollusc assemblage of the wave sheltered lagoon includes Nassarius plicatellus, Lutraria lutraria, and the bivalves Solen capensis and Gastrana matadoa, both of which no longer live along the wave-dominated southern Namibian coast. The radiocarbon ages of mollusc shell from a gravely beach deposit exposed in a diamond exploration trench indicate that sea level fell to near or 1 m below its present-day position between 6500 and 4900 cal yr BP. The rapid emergence of the pan between 6500 and 4900 cal yr BP exceeds that predicted by glacio-isostatic models and may indicate a 3-m eustatic lowering of sea level. The beach deposits at Bogenfels indicate that sea level rose to 1 m amsl between 4800 and 4600 cal yr BP and then fell briefly between 4600 and 4200 cal yr BP before returning to 1 m amsl. Since 4200 cal yr BP sea level has remained within one meter of the present-day level and the beach at Bogenfels has prograded seaward from the delayed arrival of sand by longshore drift from the Orange River. A 6200 cal yr BP coastal midden and a 600 cal yr BP midden 1.7 km from the coast indicate sporadic human utilization of the area. The results of this study are consistent with previous studies and help to refine the Holocene sea-level record for southern Africa.

scholarly journals KECEPATAN PENGANGKATAN PULAU BUTON DAN JEJAK PERUBAHANMUKA AIR LAUT DI ZAMAN KUARTER

2016 ◽  
Vol 1 (2) ◽  
Author(s):  
Prijantono Astjario ◽  
D.A. Siregar
Keyword(s):  
Sea Level ◽  
Radiocarbon Dating ◽  
Active Fault ◽  
Present Situation ◽  
Tectonic Uplift ◽  
The Other ◽  
Uplift Rate ◽  
Sea Level Fluctuations ◽  
Astronomical Theory ◽  
Reef Platform

Beberapa indikasi menunjukan adanya jejak muka laut cukup tinggi di zaman Kuarter, ketinggiannya mencapai ±250 meter diatas muka laut masa kini, ditemukan pada kawasan pantai Tira hingga Tanjung Labokeh, Buton bagian selatan. Jejak tersebut terrekam pada permukaan terumbu karang yang membentuk undak laut di kawasan pantai Buton Selatan. Tujuh buah hasil pentarikhkan Radiokarbon memberikan tiga contoh berumur 1500 hingga 3000 tahun dan contoh terumbu karang lainnya berumur lebih tua dari 40.000 tahun sebelum saat ini. Runtunan data Radiokarbon secara garis besar menunjukan kesesuaian dengan perubahan muka laut pada zaman Kuarter yang telah di prakirakan oleh teori astronomi perubahan cuaca masa lalu. Jika dibandingkan data Radiokarvbon dengan data urutan undak laut menunjukan bahwa rata-rata aktivitas tektonik pengangkatan dikawasan pantai Tira hingga Tanjung Labokeh adalah 0,7 = 0,8 mm/tahun. Pengangkatan rata-rata Pulau Buton tampak lebih cepat dari Pulau Muna akibat adanya sesar aktiv diantara kedua pulau tersebut. Several indicators of a slightly higher Quaternary sea-level, reaching about ± 250 meters above the present situation have been found along the coastas of Tira to Cape Labokeh. South Buton. They are corrals in growth position on the surface of reef platform of South Buton. Seven Radiocarbbon datings have provided ages of three samplewsa are 1500 to 3000 and the other four samples are more older than 40.000 years BP. The Radiochronological data are thus broadly consistent with the timing of sea-level fluctuations predicted by the astronomical theory of paleoclimates. Comparision with the data from terraces sequences and from Radiocarbon dating records indicates that the average tectonic uplift rate at Tira and Cape Labokeh, South Buton is on the order of 0,7 – 0.8 mm / years. The uplift rate of Buton is more faster than Muna because of the active fault in between.

scholarly journals Εκτίμηση της απώλειας παράκτιας γης λόγω της αναμενόμενης ανόδου της θαλάσσιας στάθμης στην παράκτια ζώνη Χαλκούτσι - Νέα Παλάτια (Νότιος Ευβοϊκός Κόλπος)

2017 ◽  
Vol 44 ◽  
pp. 47
Author(s):  
Σ. Πούλος ◽  
Σ. Πετράκης ◽  
Δ. Καλύβα ◽  
Μ. Πουχαρίδου
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Coastal Zone ◽  
Coastal Environments ◽  
Southern Coast ◽  
Alluvial Deposits ◽  
Wave Heights ◽  
Average Wave ◽  
Wave Conditions ◽  
Coastal Land

In the present study, the effect of the anticipated sea-level rise is investigated along the coastal zone extending in between Chalkoutsi and Nea Palatia that is located in southern coast of the semi-enclosed Southern Evoikos Gulf. The terrestrial part of the coastal zone consists of low-lying alluvial deposits, including the sensitive coastal environments of the delta of Asopos river and the Oropos lagoon located ~3 km to the east of the R. Asopos mouth. The area under investigation is already under erosion (locally, coastline retreat accounts for several metes) despite the fact that it is exposed to moderate wave conditions (average wave heights <1 m, with maximum values <2.7 m). The calcu-lated loss of coastal land, due to the anticipated sea-level rise of 0.38 m and 1 m, accounts 4-4.5 km2 and 21-23.5 km2, respectively.

scholarly journals Consequences of sea level variability and sea level rise for Cuban territory

2015 ◽  
Vol 365 ◽  
pp. 22-27
Author(s):  
M. Hernández ◽  
C. A. Martínez ◽  
O. Marzo
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Coastal Zone ◽  
Tide Gauge ◽  
High Tide ◽  
Tide Gauge Records ◽  
Sea Level Variability ◽  
Mean Sea Level ◽  
Goods And Services ◽  
Sea Level Anomalies

Abstract. The objective of the present paper was to determine a first approximation of coastal zone flooding by 2100, taking into account the more persistent processes of sea level variability and non-accelerated linear sea level rise estimation to assess the main impacts. The annual linear rate of mean sea level rise in the Cuban archipelago, obtained from the longest tide gauge records, has fluctuated between 0.005 cm/year at Casilda and 0.214 cm/year at Siboney. The main sea level rise effects for the Cuban coastal zone due to climate change and global warming are shown. Monthly and annual mean sea level anomalies, some of which are similar to or higher than the mean sea level rise estimated for halfway through the present century, reinforce the inland seawater penetration due to the semi-daily high tide. The combination of these different events will result in the loss of goods and services, and require expensive investments for adaption.

MARINE TERRACES ALONG THE MYANMAR COAST AND THEIR ACTIVE TECTONIC SIGNIFICANCE

2008 ◽  
Vol 02 (04) ◽  
pp. 267-277 ◽  
Author(s):  
WIN SWE ◽  
SOE THURA TUN
Keyword(s):  
Sea Level ◽  
Tectonic Setting ◽  
Strike Slip ◽  
Tectonic Activity ◽  
Megathrust Earthquakes ◽  
Marine Terraces ◽  
Active Tectonic ◽  
Tectonic Significance ◽  
Geomorphic Features ◽  
The Last Glacial

Wave-cut platforms, uplifted marine terraces, and areas of subsidence are among the most striking geomorphic features along some parts of the Myanmar coast. Depending on the local tectonic setting, processes of development of terraces of the Myanmar coast can be classified into at least three categories viz. (i) uplifting of wave-cut platforms or intertidal deposits by megathrust earthquakes, (ii) growth of prodelta sandbars where tectonic signatures, should they ever form, are overwhelmed by rapid sedimentation, and (iii) uplifting of wave-cut platforms or intertidal deposits developed in strike-slip related sigmoidal basins on the coast by strike-slip tectonic activity. Some of the higher flat areas behind those on or close to the shore could probably belong to the fourth category that is lowering of the sea level during the last glacial ages in Pleistocene time. Many of these terraces are still not yet properly studied, hence should be carried out.

scholarly journals New groundwater-level rise data from the Rhine-Meuse delta – implications for the reconstruction of Holocene relative mean sea-level rise and differential land-level movements

2007 ◽  
Vol 86 (4) ◽  
pp. 333-354 ◽  
Author(s):  
H.J.A. Berendsen ◽  
B Makaske ◽  
O. van de Plassche ◽  
M.H.M van Ree ◽  
S. Das ◽  
...  
Keyword(s):  
Sea Level ◽  
Groundwater Level ◽  
Radiocarbon Dating ◽  
Late Glacial ◽  
Water Levels ◽  
Plain Water ◽  
Mean Sea Level ◽  
Ams Radiocarbon Dating ◽  
Delta Plain ◽  
Aeolian Dunes

AbstractWe present new local groundwater-level rise data from two Late Glacial aeolian dunes, located near Barendrecht and Oud-Alblas in the western Rhine-Meuse delta. These data are based on AMS radiocarbon dating of terrestrial macrofossils, collected from the base of peat formed on the slopes of these dunes. This method avoids contamination of bulk peat samples by old soil carbon or younger rootlets and rhizomes, as well as the hardwater effect. The new data are used to assess the reliability of previously published groundwater-level index data based on conventional radiocarbon dating of bulk basal peat samples from the slopes of the Late Glacial aeolian dunes at Barendrecht, Hillegersberg, Bolnes and Wijngaarden, all located in the western Rhine-Meuse delta.Comparison of the new and published groundwater-level data shows no significant systematic difference between conventionally dated bulk peat samples and AMS-dated samples of terrestrial macrofossils. The new data from the dune at Barendrecht confirm the reliability of the younger than 6600 cal yr BP age-depth data from the dunes at Hillegersberg and near Bolnes. This result supports the validity of this part of the mean sea-level (MSL) curve for the western Netherlands. Consequently, the position of the groundwater-level curve for Flevoland (central Netherlands) below this MSL curve can most likely be attributed to differential land-level movement.The available data show that the groundwater-gradient effect in the western Rhine-Meuse delta became less than 5 cm/km after 6600 cal yr BP. Finally, temporal correlation between temporary increases in local groundwater-level rise with known shifts of river courses in the delta plain suggests, that avulsions can explain sudden local deviations from the trend in groundwater-level rise. A general conclusion of this study is that a complex relationship exists between sea level and local delta-plain water levels.

scholarly journals GEOMETRY OF HOLOCENE TIDAL NOTCHES – SEA LEVEL MARKERS AT PERACHORA PENINSULA, GULF OF CORINTH, GREECE

2017 ◽  
Vol 50 (1) ◽  
pp. 468
Author(s):  
S. Schneiderwind ◽  
M. Kázmér ◽  
S. Boulton ◽  
I. Papanikolaou ◽  
K. Reicherter
Keyword(s):  
High Resolution ◽  
Sea Level ◽  
Laser Scanning ◽  
Seismic Event ◽  
Tectonic Activity ◽  
Level Indicator ◽  
Mean Sea Level ◽  
Related Information ◽  
Gulf Of Corinth ◽  
Coastal Cliffs

Tidal notches are a generally accepted sea level indicator that, when different from mean sea level, witness tectonic activity at or near coastlines. However, how to infer related information is controversial since tectonic uplift from a single seismic event is not likely to exceed several decimetres. High resolution laser scanning offers the availability of close-up views on exposures and to detect evidence for multiple sea level indicators in between major emergence. Statistically representative profiles along exposure were analysed in order to prove for already described tidal notches and to highlight similar shapes in consistent geometries along coastal cliffs of Perachora Peninsula.

scholarly journals Finding of a Holocene marine layer in Algarrobo (33°22'S), central Chile. Implications for coastal uplift

2010 ◽  
Vol 33 (2) ◽  
pp. 339 ◽  
Author(s):  
Alfonso Encinas ◽  
Francisco Herve ◽  
Rodrigo Villa-Martinez ◽  
Sven N. Nielsen ◽  
Kenneth L. Finger ◽  
...  
Keyword(s):  
Sea Level ◽  
Marine Environment ◽  
Radiocarbon Dating ◽  
Warm Climate ◽  
Central Chile ◽  
Mean Sea Level ◽  
Water Well ◽  
Coastal Uplift ◽  
Wood Fragment ◽  
Marine Layer

A buried Holocene marine bed was discovered upon drilling a water well in Algarrobo (33°22'S), located on the coast of central Chile. Radiocarbon dating of a wood fragment found within the deposit indicates an age of 6450 cal yr BP. The top of this bed, 0.25 m-thick, was reached at an elevation of 3.8 m above mean sea level. This bed contains abundant monospecific faunas of foraminifers (Ammonia tepida) and ostracodes (Cyprideis beaconensis), indicative of deposition in a very shallow, transitional marine environment. Palynologic analysis reveals a Chenopodiaceae-dominated (~70%) assemblage, indicating a relatively arid and warm climate.

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