Citation:

epic.29866.d001

Name: Geometric parameters of shoreface profiles of Laptev Sea erosion coast (Table 1)
Published: 2002
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Field investigations of the Laptev Sea shoreface morphology were carried out (1) off erosional shores composed of unconsolidated sediments, (2) off the modern delta shores of the Lena River, and (3) off rocky shores.

It was found that profiles off erosional shores had a concave shape. This shape is not well described by commonly applied power functions, a feature, which is in disagreement with the generally accepted concept of the equilibrium shape of shoreface profiles. The position of the lower shoreface boundary is determined by the elevation of the coastal lowland inundated during the last transgression (at -5 to -10 m) and may easily be recognized by a sharp, an order of magnitude decrease in the mean inclination of the sea floor. The mean shoreface inclination depends on sediment grain-size and ranges from 0.0022 to 0.033. The concave shape of the shoreface did not change substantially during the last 20-30 years, which indicates that shoreline retreat did not slow down and hence suggests continued intensive coastal erosion in the 21st century.

The underwater part of the Lena River delta extends up to 35 km offshore. Its upper part is formed by a shallow and up to 18-km wide bench, which reaches depths of 2-3 m along the outer edge. The evolution of the delta was irregular. Whereas some parts of the delta are advancing rapidly (58 m/year), other parts are eroding. Comparison of measured profiles with older bathymetric data gave an opportunity to evaluate the changes of the underwater delta over past decades. Bathymetric surveys of the seabed around the delta can thus contribute towards a quantification of the sediment budget of the river-sea system.

In addition, some sections of the Laptev Sea coast are composed of bedrock that has a comparatively low resistance to wave erosion. These sections may supply a considerable amount of sediment, especially if the cliffs are high. This source must therefore also be taken into account when assessing the contribution of shore erosion to the Laptev Sea sediment budget.

Project(s):

Laptev Sea System (LSS)

Coverage:

Median Latitude: 73.371113 * Median Longitude: 127.241093 * South-bound Latitude: 71.333300 * West-bound Longitude: 113.250000 * North-bound Latitude: 74.833300 * East-bound Longitude: 145.583300

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	LATITUDE	Latitude				Geocode
2	LONGITUDE	Longitude				Geocode
3	Lithology/composition/facies	Lithology		Are, Felix	Visual description
4	Area/locality	Area		Are, Felix
5	Inclination	Incl	deg	Are, Felix		sea floor inclination, shoreface upper part
6	Inclination	Incl	deg	Are, Felix		sea floor inclination, mean value
7	Inclination	Incl	deg	Are, Felix		sea floor inclination, beyond the shoreface
8	Shoreface depth	Shoreface	m	Are, Felix	Measured
9	Width	w	m	Are, Felix		shoreface

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

104 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Latitude	2 Longitude	3 Lithology (Visual description)	4 Area	5 Incl [deg] (sea floor inclination, shoref...)	6 Incl [deg] (sea floor inclination, mean v...)	7 Incl [deg] (sea floor inclination, beyond...)	8 Shoreface [m] (Measured)	9 w [m] (shoreface)
71.3333	131.9333	Ice complex East	Buor-Khaya Peninsula	0.016	0.004	0.001	10.0	2300
71.8667	138.4167	Ice complex East	Makar Island	0.005	0.002	0.000	10.0	6700
72.2333	139.0833	Ice complex East	Shirokostan Peninsula	0.004	0.003	0.000	10.6	3500
72.7000	145.5833	Ice complex East	Kondratyeva River mouth	0.001	0.001	0.000	13.4
73.3167	141.1833	Ice complex East	Zimovyo River mouth	0.002	0.001	0.000	10.8	9500
73.5667	117.8333	Ice complex West	Cape Mamontov Klyk	0.002	0.002	0.000	4.6	2900
73.5833	118.5500	Ice complex West	Cape Terpyay-Tumsa	0.006	0.003	0.000	5.2	1500
73.6500	123.2833	Sands	Arga Island North	0.022	0.010	0.000	5.4	600
73.3667	123.3333	Sands	Arga Island South	0.012	0.004	0.000	10.8	2800
73.6667	125.8500	Sands	Kuba Island	0.003	0.002	0.001	5.0	2000
73.9167	123.1333	Sands	Aerosyomka Island	0.010	0.010	0.001	5.8	600
72.8667	140.6833	Gravel	Cape Svyatoy Nos	0.050	0.033	0.004	6.0	200
74.8333	113.2500	Bedrock	Cape Tsvetkova	0.036	0.006	0.001	6.4	600
74.8333	113.2500	Bedrock	Cape Tsvetkova	0.036	0.006	0.001	15.2	2600
74.8333	113.2500	Bedrock	Cape Tsvetkova	0.036	0.006	0.001	25.0	4200