scholarly journals Core-derived historical records of suspended sediment origin in a mesoscale mountainous catchment: the River Bléone, French Alps

2012 ◽  
Vol 12 (9) ◽  
pp. 1463-1478 ◽  
Author(s):  
Oldrich Navratil ◽  
Olivier Evrard ◽  
Michel Esteves ◽  
Sophie Ayrault ◽  
Irène Lefèvre ◽  
...  
Keyword(s):  
Suspended Sediment ◽  
Historical Records ◽  
French Alps ◽  
Mountainous Catchment

scholarly journals Effects of cultivation and reforestation on suspended sediment concentrations: a case study in a mountainous catchment in China

2016 ◽  
Vol 20 (1) ◽  
pp. 13-25 ◽  
Author(s):  
N. F. Fang ◽  
F. X. Chen ◽  
H. Y. Zhang ◽  
Y. X. Wang ◽  
Z. H. Shi
Keyword(s):  
Suspended Sediment ◽  
Kendall Test ◽  
Sediment Concentration ◽  
High Flow ◽  
Mountainous Catchment ◽  
Stable Relationship ◽  
Suspended Sediment Concentrations ◽  
The Mean ◽  
Responsibility System

Abstract. Understanding how sediment concentrations vary with land use/cover is critical for evaluating the current and future impacts of human activities on river systems. This paper presents suspended sediment concentration (SSC) dynamics and the relationship between SSC and discharge (Q) in the 8973 km2 Du catchment and its sub-catchment (4635 km2). In the Du catchment and its sub-catchment, 4235 and 3980 paired SSC–Q samples, respectively, were collected over 30 years. Under the influence of the Household Contract Responsibility System and Grain-for-Green projects in China, three periods were designated, the original period (1980s), cultivation period (1990s) and reforestation period (2000s). The results of a Mann–Kendall test showed that rainfall slightly increased during the study years; however, the annual discharge and sediment load significantly decreased. The annual suspended sediment yield of the Du catchment varied between 1.3  ×  108 and 1.0  ×  1010 kg, and that of the sub-catchment varied between 6.3  ×  107 and 4.3  ×  109 kg. The SSCs in the catchment and sub-catchment fluctuated between 1 and 22400 g m−3 and between 1 and 31800 g m−3, respectively. The mean SSC of the Du catchment was relatively stable during the three periods (±83 g m−3). ANOVA (analysis of variance) indicated that the SSC did not significantly change under cultivation for low and moderate flows, but was significantly different under high flow during reforestation of the Du catchment. The SSC in the sub-catchment was more variable, and the mean SSC in the sub-catchment varied from 1058 ± 2217 g m−3 in the 1980s to 1256 ± 2496 g m−3 in the 1990s and 891 ± 1558 g m−3 in the 2000s. Reforestation significantly decreased the SSCs during low and moderate flows, whereas cultivation increased the SSCs during high flow. The sediment rating curves showed a stable relationship between the SSC and Q in the Du catchment during the three periods. However, the SSC–Q of the sub-catchment exhibited scattered relationships during the original and cultivation periods and a more linear relationship during the reforestation period.

scholarly journals Suspended sediment dynamics in a Southeast Asian mountainous catchment: Combining river monitoring and fallout radionuclide tracers

2014 ◽  
Vol 519 ◽  
pp. 1811-1823 ◽  
Author(s):  
Elian Gourdin ◽  
Olivier Evrard ◽  
Sylvain Huon ◽  
Irène Lefèvre ◽  
Olivier Ribolzi ◽  
...  
Keyword(s):  
Suspended Sediment ◽  
Southeast Asian ◽  
Sediment Dynamics ◽  
River Monitoring ◽  
Mountainous Catchment ◽  
Radionuclide Tracers ◽  
Fallout Radionuclide

Effect of seasonal snow cover on suspended sediment runoff in a mountainous catchment

2012 ◽  
Vol 428-429 ◽  
pp. 116-128 ◽  
Author(s):  
Toshiaki Iida ◽  
Akihiko Kajihara ◽  
Hiroshi Okubo ◽  
Kenji Okajima
Keyword(s):  
Snow Cover ◽  
Suspended Sediment ◽  
Sediment Runoff ◽  
Mountainous Catchment ◽  
Seasonal Snow ◽  
Seasonal Snow Cover

scholarly journals Linking Large-scale Circulation Descriptors to Precipitation Variability in the Northern French Alps

2021 ◽  
Author(s):  
Antoine Blanc ◽  
Juliette Blanchet ◽  
Jean-Dominique Creutin
Keyword(s):  
Pressure Difference ◽  
Large Scale ◽  
Western Europe ◽  
Precipitation Variability ◽  
Medium Size ◽  
Maximum Pressure ◽  
Large Scale Circulation ◽  
French Alps ◽  
Mountainous Catchment ◽  
The North

<p>This work analyses the link between Western Europe large-scale circulation and precipitation variability in the Northern French Alps from 1950 to 2017. We consider simple descriptors characterizing the daily 500hPa geopotential height fields. They are the Maximum Pressure Difference - representing the range of geopotential heights over Western Europe -, and the singularity - representing the mean distance between a geopotential shape and its closest analogs, i.e. the way this geopotential shape is reproduced in the climatology. These descriptors are compared to the occurrence of different atmospheric influences - Atlantic, Mediterranean, Northeast, Anticyclonic - and to the leading mode of large-scale circulation variability over Europe - the North Atlantic Oscillation (NAO) - for explaining precipitation variability in the Isère River catchment from one day to 10 years. We show that the Maximum Pressure Difference and the singularity of geopotential shapes explain a significant part of precipitation variability in the Northern French Alps from 10 days to 10 years, especially in winter (correlation values of 0.7). These descriptors provide much better performance than NAO and the same performance as the occurrence of the Atlantic influence, which is the best performing atmospheric influence. This means that simple characteristics of large-scale circulation - that are easy to implement - provide as much information as weather pattern classification to explain precipitation variability over a medium size mountainous catchment. Furthermore, we show that NAO does not drive the pressure gradient in a domain spreading from the Iberic Peninsula to Southern Great Britain and weakly explains precipitation variability in the Northern French Alps.</p>

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