Results 121 to 130 of about 35,344 (313)

Lecture notes on sediment transportation and channel stability [PDF]

, 1961
These notes have been prepared for a series of lectures on sediment transportation and channel stability given by the authors to a group of engineers and geologists of the U. S. Department of Agriculture assembled at Caltech on September 12-16,1960. The
Brooks, Norman H., Kennedy, John F. (John Fisher), Vanoni, Vito A.   +2 more
core   +1 more source

Dismantling the genus Tarenna (Rubiaceae: Pavetteae) in Africa and Madagascar, with the description of three new genera

TAXON, EarlyView.
Abstract As presently circumscribed, the Paleotropical genus Tarenna, belonging to the tribe Pavetteae (Rubiaceae), comprises about 200 species and has its centres of diversity in tropical Asia and Africa. Previous molecular phylogenetic studies of the tribe revealed the polyphyly of Tarenna, suggesting that the genus needs to be recircumscribed ...
Petra De Block, Sylvain G. Razafimandimbison, Franck Rakotonasolo, Steven B. Janssens   +3 more
wiley   +1 more source

Laboratory Flume Experiments on the Formation of Spanwise Large Wood Accumulations: Part II—Effect on local scour

Water Resources Research, 2019
In this second companion paper, hydraulic model tests were conducted to analyze local scour due to natural spanwise large wood (LW) accumulations. Spanwise accumulations were modeled using a vertical barrier, similar to a LW retention rack in prototype ...
I. Schalko, C. Lageder, L. Schmocker, V. Weitbrecht, R. M. Boes   +4 more
doaj   +1 more source

Multi-approach analysis of maximum riverbed scour depth above subway tunnel

Water Science and Engineering, 2010
When subway tunnels are routed underneath rivers, riverbed scour may expose the structure, with potentially severe consequences. Thus, it is important to identify the maximum scour depth to ensure that the designed buried depth is adequate.
Jun Chen, Hong-wu Tang, Zui-sen Li, Wen-hong Dai   +3 more
doaj   +1 more source

Morphologische Entwicklung des Ucayali in Peru ohne menschliche Einflüsse [PDF]

, 2013
The Ucayali River originates in the high Andean Mountains near the city of Cusco in Peru. After about 1,600 km, it joins with the Marañón River. Both the Ucayali River and the Marañón River are sources of the Amazon.
Alvarado-Ancieta, Cesar Adolfo, Ettmer, Bernd   +1 more
core  

Long‐term protection in grasslands enhances soil carbon storage through reduced disturbance and community trait diversity–environment adaptations

Functional Ecology, EarlyView.
Read the free Plain Language Summary for this article on the Journal blog. Abstract Understanding how ecological disturbance and plant community traits regulate soil carbon storage is critical for predicting ecosystem feedbacks to global change and designing sustainable land‐use strategies.
Yves Theoneste Murindangabo, Ondřej Mudrák, Martin Bartuška, Jaroslava Frouzová, Olha Kachalová, Jakub Houška, Jan Frouz   +6 more
wiley   +1 more source

Experimental investigation of scour downstream of a type A trapezoidal piano key weir under free and submerged flow conditions

Journal of Hydrology and Hydromechanics
In this paper, the scour downstream of a trapezoidal Piano key weir (PKW) is investigated under free and submerged flow conditions. For this purpose, an experimental model was used in a laboratory channel with a length of 10 m, width of 0.75 m, and ...
Bodaghi Elnaz, Abdi-Chooplou Chonoor, Ghodsian Masoud   +2 more
doaj   +1 more source

Herbivore and mesocarnivore carcasses trigger divergent short‐term changes in soil properties

Journal of Animal Ecology, EarlyView.
Scavengers reshape nutrient cycles in soils under carrion. Compared to herbivore carcasses, smaller but longer‐lasting carnivore remains boost nutrient levels and microbial activity in dry soils. Abstract Animal corpses act as pulses of organic matter (OM) and serve a key zoogeochemical role by providing localized nutrient inputs to soils and thereby ...
Adrián Colino‐Barea, Fuensanta García‐Orenes, Zebensui Morales‐Reyes, Moisés Gonzálvez, Carlos Martínez‐Carrasco, Marcos Moleón, Daniel Redondo‐Gómez, Evan A. N. Marks, Minerva García‐Carmona, Victoria Arcenegui, José Carlos Huerta‐del‐Bosque, Adrián Orihuela‐Torres, Santiago Soliveres, Sofia Albolafio, Esther Sebastián‐González, José Antonio Sánchez‐Zapata   +15 more
wiley   +1 more source

Influence of scour depth and flow velocity field on large-diameter pier group pile foundations

Frontiers in Marine Science
Sea-crossing bridges face critical challenges due to scour, which can destabilize foundations. This study investigates the scour characteristics of the large-diameter main pier of the Haiwen Bridge, with a pile diameter of 4.3 meters. Seabed changes were
Junfeng Shi, Changhai Han, Huijuan Guo, Kaiwen Yu, Kang Han   +4 more
doaj   +1 more source

Towards an anthropology of acquisition: ‘How did you get that?’ Vers une anthropologie de l'acquisition : « Où as‐tu trouvé ça ? »

Journal of the Royal Anthropological Institute, EarlyView.
The production‐distribution‐consumption triad has structured how anthropologists understand exchange for roughly a century. This article argues for expanding this triad to include an explicit focus on acquisition – the systems, processes, and practices of acquiring.
Hanna Garth
wiley   +1 more source