Search results for "Drain"
showing 10 items of 417 documents
Hydrological Analysis of Loess Plateau Highland Control Schemes in Dongzhi Plateau
2020
Gully Consolidation and Highland Protection (GCHP) Project is a major soil and water conservation and land remediation project implemented in the Chinese Loess Plateau (CLP). As the connection between the mechanisms of erosion and practical applications for addressing it is not clear, the implementation of engineering measures to combat the problem has been insufficient to date. This study used field investigation and descriptive statistics, together with hydrological analysis modeling to gain an understanding of the impact of the Loess Plateau Highland Control Schemes on the evolution of the Dongzhi Plateau as the largest, most well-preserved, and the thickest loess deposit region in China…
Assessment and mapping the sensitive areas to desertification in an insular Sahelian mountain region Case study of the Ribeira Seca Watershed, Santia…
2015
10 pages; International audience; This paper presents the assessment and mapping of the Ribeira Seca catchment, an insular Sahelian mountain region sensitive to desertification, located on the island of Santiago, Cabo Verde. Desertification is a threat to the global environment, representing a serious ecological problem in Cabo Verde. To successfully combat desertification, an evaluation of desertification consequences is required and the building of cartography of the sensitivity for arid and semi-arid ecosystems is required as a first step. The MEDALUS model was the basis for this study in which six quality indicators were used: climate, soil, vegetation, land management, erosion and soci…
A BMA Analysis to Assess the Urbanization and Climate Change Impact on Urban Watershed Runoff
2016
Abstract A reliable planning of urban drainage systems aimed at the mitigation of flooding, should take into account the possible change over time of impervious cover in the urban watershed and of the climate features. The present study proposes a methodology to analyze the changing in runoff response for a urban watershed accounting several plausible future states of new urbanization and climate. To this aim, several models simulating the evolution scenario of impervious watershed area and of climate change were adopted. However, it is known that an evolution scenario represents only one of all possible occurrence and it is not necessary the true future state, therefore it is needed to fin…
Dissolved silica in the Garonne River waters : changes in the weathering dynamics
2000
The major ion chemistry of the Garonne River is indicative of seasonal variations in the weathering dynamics of the drainage basin. Using the geochemical model MEGA for calculation of the contribution of atmospheric CO2 to the total bicarbonate fluxes exported by the Garonne River allows estimations of the concentrations of the major dissolved elements that originate from silicate- and carbonate-rock weathering. The molecular ratio SiO2/Al2O3 was calculated for the 1989–1992 period to identify the main type of weathering in the Garonne River, and montmorillonite was shown to be the major mineral occurring in the weathering products. The seasonal variations of the SiO2/Al2O3 ratio also showe…
Alachlor and Bentazone Losses from Subsurface Drainage of Two Soils
2004
International audience; Atrazine (6-chloro-N2-ethyl-N4-isopropyl-1,3,5-triazine-2,4-diamine) is frequently detected at high concentrations in ground water. Bentazone [3-isopropyl-1H-2,1,3-benzothiadiazin-4(3H)-one 2,2-dioxide] plus alachlor (2-chloro-2',6'-diethyl-N-methoxymethylacetanilide) is a potential herbicide combination used as a substitute for atrazine. Thus, the objective of this study was to assess the environmental risk of this blend. Drainage water contamination by bentazone and alachlor was assessed in silty clay (Vertic Eutrochrept) and silt loam (Aquic Hapludalf) soils under the same management and climatic conditions. Drainage volumes and concentrations of alachlor and bent…
Évolution du bilan hydrique à l'échelle de bassins versants en contexte de changement climatique – mise place d’une méthodologie
2014
Assessment of hydric balance at the catchment scale, under climate change scenario Face to climate change, public policies must implement adaptation strategies. This implies that the effects of climate change are plainly identified on territories. However, in the current state, data and knowledge at the local level are limited or not available to decision makers. This work proposes to well characterize the local impacts of climate change and to develop synergies between researchers and territorial actors to prepare the public decision.
Laudun-L'Ardoise (30), Avenue du Général de Gaulle
2021
Le diagnostic de l’avenue du Général de Gaulle se situe au sud-est du village actuel de Laudun. Malgré un environnement archéologique relativement riche, cette intervention n’aura livré, sur les 16 000 m² testés, qu’une fosse de l’âge du Bronze, témoin le plus méridional de l’occupation identifiée sous le lotissement de l’Oppidum, deux fossés encadrant peut-être un chemin antique et une fosse récente contenant les restes d’un équidé. Au nord, la présence marquée de mobiliers antiques dans les sédiments de surface du lotissement de l’Oppidum laissait présager une occupation de cette période à proximité, qui n’a pas été confirmée sur l’emprise de ce nouveau diagnostic. Si elle existe, elle po…
La Chapelle-d'Armentières (Nord), avenue Paul Harris : rapport de diagnostic
2017
Lesquin (Nord), ZAC du Mélantois, Au Chemin Perdu : la nécropole mérovingienne du hameau de Merchin (zone 2) (fin Ve siècle-début VIIIe siècle) : rap…
2015
La construction d'un complexe d'entreprises au hameau de Merchin, au sein d'une zone sensible de découvertes archéologiques, a motivé plusieurs prescriptions de fouille qui se sont déroulées entre l'été 2008 et l'été 2009. Elles ont porté sur un ensemble de structures néolithiques, sur un complexe à vocation agro-pastoral protohistorique/antique, et, enfin, sur une nécropole du premier Moyen Âge. Inscrite dans un terroir occupé de manière plus ou moins continue depuis le Hallstatt jusqu'au bas Moyen Âge, la nécropole mérovingienne de Lesquin est localisée sur la frange orientale du plateau du Mélantois. Elle supplante une occupation débutée au Hallstatt au travers de l'élément structurant l…
Prediction of hydraulic and acoustic properties of open-graded mixes
2014
The use of open-graded mixes increases significantly the hydraulic permeability of pavement and contributes to reduce the noise impact in comparison to traditional pavement. Such characteristics are very appealing and would greatly increase driver's safety. However, during service life, the pores tend to be clogged by many factors among them secondary traffic compaction and filling of voids by fine materials are relevant, especially on heavy routes. In this case the noise reduction and drainage capabilities will gradually disappear, causing serious problems for road safety and maintenance. In this paper we propose a simulation approach in order to predict the drainage and acoustic behavior …