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Wyszukujesz frazę "tree windthrow" wg kryterium: Temat


Wyświetlanie 1-2 z 2
Tytuł:
Problems of preservation at the Neolithic lakeside settlements at Lake Burgäschi, Switzerland. A case study of the effects of an artificial lowering of the lake level in 1943
Autorzy:
Hostettler, Marco
Hafner, Albert
Powiązania:
https://bibliotekanauki.pl/articles/1366040.pdf
Data publikacji:
2020-12-24
Wydawca:
Łódzkie Towarzystwo Naukowe
Tematy:
in-situ preservation
drainage of wetlands
organic deterioration
tree windthrow
wetland archaeology
Beyond Lake Villages
Opis:
This paper describes recently observed severe preservation problems at the Neolithic lakeside settlement of Aeschi SO, Burgäschisee, Nord. The site is located on Lake Burgäschi, a small water body of late-glacial origin in Central Switzerland. Since an artificial lake lowering in 1943 and draining of the site, the originally waterlogged sediments have been increasingly drying out. Recent fieldwork on the site (2015–17) and its evaluation gave the opportunity to directly assess the actual preservation status of the archaeological site. The excavations show that the archaeological remains are affected by mechanical destruction caused by draining cracks and fissures and tree-uprooting, which have mixed parts of the stratigraphic sequences. Additionally, the organic matter is heavily deteriorated and most organic artefacts and environmental data are lost forever. The comparison of the newly obtained observations with older excavation data and neighbouring sites confirms a high loss of archaeological information. Even though there exist examples for successful rewetting and insitu conservation of archaeological wetland sites, for the site of Aeschi SO, Burgäschisee, Nord the most reasonable measure to undertake seems to be a rescue excavation.
Źródło:
Acta Geographica Lodziensia; 2020, 110; 125-135
0065-1249
Pojawia się w:
Acta Geographica Lodziensia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stability Assessment and Composition of Tree Species in Nigerian University
Autorzy:
Chukwu, Onyekachi
Chenge, Iveren B.
Powiązania:
https://bibliotekanauki.pl/articles/1178080.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Tree stability
slenderness coefficient
species composition
windthrow
Opis:
Wind remains a strong abiotic agent associated with damages of forest trees. The vulnerability of a tree to windthrow is highly influenced by the ratio of tree total height to its stem diameter (RHD). However, RHD has been identified as an index and measure of tree and stand stability. This study assessed the stability and composition of open grown tree species in the University of Ibadan, Nigeria. Diameter at breast height (Dbh) and total height (THt) of one hundred and thirty-nine (139) trees species with Dbh ≥5.0 cm found within three departments of the University were measured. A total of 36 species from 17 families were identified with Myrtaceae and Combretaceae families having highest (28.8% and 21.6%, respectively) numbers of tree. RHD was found to have negative correlation with all the tree growth variables investigated except THt. However, this study reveals that about 79 % of the trees found in the study area had RHD <80, indicating stable and low risk or susceptibility to windthrow, wind-induced bending and breakage. Hence, trees with RHD >80 (21%) were recommended for felling as they pose threat to human life and properties in the study area.
Źródło:
World Scientific News; 2018, 95; 235-245
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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