Search results for "Luvia"
showing 10 items of 223 documents
Una revisió de les crescudes de 1949 a la plana del Xúquer-Túria
2012
El presente trabajo revisa las riadas de 1949, poco antes de que las obras de regulación alteraran el régimen de los ríos principales. Ese año se registraron al menos tres crecidas de diversa magnitud y tipología (invierno, primavera, otoño) en el litoral valenciano. En la primera parte del trabajo se documentan y describen las acontecidas en la llanura aluvial de los ríos Júcar y Turia, principalmente a partir de noticias de prensa. La segunda parte analiza y reconstruye las características hidrológicas de la avenida del 28 de septiembre en el Camp de Turia y L’Horta de València dada su magnitud extraordinaria. También se incide en el carácter vulnerable de la sociedad y en el impacto de a…
Estudio sedimentológico de los depósitos de inundación en la Ribera del Xúqer (Valencia), en octubre de1982
2013
As a result of the sedimentological study of a series of deposits corresponding to the exceptional flood in the Xuquer River in October 1982, we analyze the behaviour of fluvial dynamics. The sedimentary response enables us lo perceive certain differences between the deposits analyzed, bUI these do not completely adjust to the genetic patterns considered in the classic Geomorphology as the producers ofthe traits ofvertical growth generated during floods.
Ecotoxicity of sediments in rivers: Invertebrate community, toxicity bioassays and the toxic unit approach as complementary assessment tools
2015
The determination of the real toxicity of sediments in aquatic ecosystems is challenging and necessary for an appropriate risk assessment. Different approaches have been developed and applied over the last several decades. Currently, the joint implementation of chemical, ecological and toxicological tools is recommended for an appropriate and successful toxicity risk assessment. We chose the combination of the toxic unit approach with acute pore water tests (Vibrio fischeri, Pseudokirchneriella subcapitata and Daphnia magna) and whole-sediment exposure tests (V. fischeri, Chironomus riparius), together with invertebrate community composition (multivariate analyses) to detect short and long-…
Las lluvias torrenciales de septiembre de 1989 en el Mediterráneo español
1990
EL TRABAJO QUE ANALIZA LA VIOLENTA CICLOGENESIS QUE SE ABATIO SOBRE EL MEDITERRANEO ESPAÑOL EN SEPTIEMBRE DE 1989, INTENTA PONER DE MANIFIESTO LAS COMPLEJAS INTERACCIONES QUE ACTUAN PARA EL DESENCADENAMIENTO DE TALES FENOMENOS. SE INSISTE SOBRE TODO EN LA TRANSFERENCIA Y ACUMULACION DE ENERGIA TERMICA EN EL MAR COMO FACTOR DESTACADO DE ESTAS CICLOGENESIS. EL TRABAJO, TAMBIEN CON INQUIETUDES DIDACTICAS, MUESTRA COMO LA T.S.M. JUNTO CON OTROS PROCESOS GEOGRAFICOS, ATMOSFERICOS Y MEDIOAMBIENTALES, SON ELEMENTOS CRUCIALES PARA ENTENDER ESAS SEVERAS CICLOGENESIS. (A)
Pluvial flooding in urban areas: the role of surface drainage efficiency
2018
Pluvial flooding in urban areas may derive from the limited or temporarily reduced efficiency of surface drainage, even when the underlying storm sewers are properly designed. This study focuses on the impact of uncertainties in the operational condition of the surface drainage system on pluvial flood hazard. The flood propagation model FLURB-2D is implemented on a selected study area in the town of Genoa (Italy). Synthetic hyetographs based on the Chicago and bivariate copula methods with suitable return periods are used as input. While simulating the design rainfall, inlet operational conditions are varied stochastically using a Monte Carlo approach. Results confirm that microtopography h…
Latvijas ūdeņu vides pētījumu un aizsardzība: referātu tēžu krājums (Rīga, 2020.gada 24. janvāris)
2020
Fluvial eco-hydraulics and morphodynamics: New insights and challenges
2015
The paper concerns the mechanisms underlying the distribution of the bed shear stress in meandering bends. Literature indicates that cross-stream circulation strongly affects the redistribution of the downstream velocity, but the feedback between them is still poorly understood. The aim of this paper is to gain some insight into how the momentum transport by cross-stream circulation contributes to the bed shear stress redistribution. Experimental analysis, based on a detailed dataset collected in a large-amplitude meandering laboratory flume, is presented. From these data an evaluation is made of the terms in the depth-averaged momentum equations and the analysis is especially devoted to te…
Vegetation as a tool in the interpretation of fluvial geomorphic processes and landforms
2016
Particularities of Grey Alder (Alnus incana) Stands in Riparian Galleries Along Streams of the Southern Transylvanian Tableland (Romania)
2019
Abstract Grey Alder (Alnus incana (L.) Moench.) stands are distributed in the Carpathian area on alluvial deposits with sediments of different grain size as galleries along rivers and streams of the sub-montane to the middle montane level. The geological structure (Tertiary sedimentary deposits) in relation to the hydromorphological processes is the base for the structure of the stream valleys, which are in part very deep. Under the special microclimate of these deeper stream stretches with lower temperatures there are favourable conditions for the development of grey alder stands.
The formation of alluvial fans and young floodplain deposits in the Lieser catchment, Eifel Mountains, western German Uplands: A study of soil erosio…
2011
This study deals with the exploration and spatiotemporal quantification of the young Holocene, nearly skeleton-free floodplain sediments of the Lieser River, a tributary of the Mosel River in the Eifel Mts. The deposits are primarily a consequence of anthropogenic-triggered soil erosion in the catchment. To observe the phenomenon of corresponding soil erosion on multiple levels two small alluvial fans of tributary catchments were investigated. For comparison, one location in the neighboring Salm valley was described. The results were compared with those of other streams. With extensive fieldwork more than 100 drillings and pits were made at 12 locations. For dating the sediments OSL dating…