Nylandsfjärden Bay
The core-to-core correlation in this bay of the Gulf of Bothnia is based on radiographs of four sediment cores, sampled in the inner, northern part of the bay, just in front of the submarine delta of the river Ångermanälven.
Nylandsfjärden Bay
The core-to-core correlation in this bay of the Gulf of Bothnia is based on radiographs of four sediment cores, sampled in the inner, northern part of the bay, just in front of the submarine delta of the river Ångermanälven.
Partly overlapping radiographs of the upper, middle and lower part of core 491 from a depth of 36 m in the northern part of the bay Nylandsfjärden, just downstream the submarine delta of the river Ångermanälven. Observe the rather compact and thick turbidite layers formed in 1967.
The turbidites in 1967 are the result of the submarine slides, which occurred at the end of March, when large and rapid water-level variations were recorded at the delta front. See also the curves below, showing the downcore variation and the accumulated amount of solids in the upper part of core 491.
Downcore variation in content of solids, calculated from the recorded film density along the centerline of the radiograph of the upper part of core 491. The accumulated amount of solids down to a depth of 10 cm is used as a hardness index of the bottom. The radiographically calculated amount of solids (yr) down to a depth of 208 mm is 99.2 % of the amount found by drying and weighing the deposits (y1). From Axelsson 1983 (Hydrobiologia 103).
Radiographic comparison between the uppermost part of cores 491 and 966 from Nylandsfjärden.
Core 966 was sampled in the same area as core 491 but from a place situated about 2 m deeper (38 m) and sampled about four and a half year later. As shown X-ray radiographs simplifies the core-to-core correlation and the monitoring of sediment accumulation.
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