Article (Scientific journals)
Late Holocene changes on erosion pattern on a lacustrine environment: landscape stabilization by volcanic activity versus human activity
Lamair, Laura; Hubert, Aurelia; El Ouahabi, Meriam et al.
2018In Geochemistry, Geophysics, Geosystems (G3)
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Abstract :
[en] The most recent eruption of Mt. Fuji (Japan), the VEI 5 Hōei plinian eruption (CE 1707) heavily impacted Lake Yamanaka, a shallow lake located at the foot of Mt. Fuji. Here, we discuss the influence of the Hōei eruption on the lacustrine sedimentation of Lake Yamanaka using high resolution geophysical and geochemical measurements on gravity cores. Hōei scoria fall-out had two major impacts on Lake Yamanaka: (i) reduction of the sedimentation rate (from ~0.16 cm/yr to ~0.09 cm/yr); and (ii) the increase of in-situ lake productivity. Sedimentation rates after the eruption were relatively low due to the thick scoria layer, trapping underlying sediments in the catchment. The lacustrine system took over more than ~170 years to begin to recover from the Hōei eruption: sedimentation recovery have been accelerated by changes in land use. Since the beginning of the 20th Century, vegetated strips delimited cultivated parcels, trapping sediment and minimizing the anthropogenic impacts on the sedimentation rate. Over the last decade, the decline of agriculture and the increase of other human activities led to an increase in the sedimentation rate (~1 cm/yr). This study highlights the effect of the grainsize of the volcanic ejecta on the sedimentation rate following a volcanic eruption. Coarse-grained tephra are difficult to erode. Therefore, their erosion and remobilization is largely limited to intense typhoons when porous scoria deposits are saturated by heavy rains. Moreover, this study suggests that recent anthropogenic modifications of the catchment had a greater impact on the sedimentation rate than the Hōei eruption.
Disciplines :
Earth sciences & physical geography
Author, co-author :
Lamair, Laura ;  Université de Liège - ULiège > SPHERES
Hubert, Aurelia  ;  Université de Liège - ULiège > Département de géographie > Géomorphologie et Géologie du Quaternaire
El Ouahabi, Meriam  ;  Université de Liège - ULiège > Département de géographie > Géomorphologie et Géologie du Quaternaire
Yamamoto, Shinya
Schmidt, Sabine
Vander Auwera, Jacqueline ;  Université de Liège - ULiège > Département de géologie > Pétrologie, géochimie endogènes et pétrophysique
Lepoint, Gilles  ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Océanographie biologique
Boes, Evelien
Fujiwara, Osamu
Yokoyama, Yususke
De Batist, Marc
Heyvaert, Vanessa
Language :
English
Title :
Late Holocene changes on erosion pattern on a lacustrine environment: landscape stabilization by volcanic activity versus human activity
Publication date :
2018
Journal title :
Geochemistry, Geophysics, Geosystems (G3)
eISSN :
1525-2027
Publisher :
Wiley-Blackwell, United States - Washington
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
QuakeRecNankai
Funders :
Belspo BRAIN
Available on ORBi :
since 01 July 2018

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