Solr Search · GéoProdig, portail d'information géographique

Sediment yield modelling in Erosion and sediment yield : some methods of measurement and modelling.

Sediment yield modelling in Erosion and sediment yield : some methods of measurement and modelling.
Sediment yield models vary considerably to accomodate the wide range of water resources problems where sediment yield estimates are needed : erosion control planning, water resources planning and design, water quality modelling. The simplest models

Model study of the relationship between sediment yield and river basin area

Model study of the relationship between sediment yield and river basin area
Bassin-versant ; Bilan sédimentaire ; Domaine semi-aride ; Erosion des sols ; Italie ; Modèle ; Portugal ; Précipitation ; Simulation ; Utilisation du sol
Italy ; Land use ; Model ; Portugal ; Precipitation ; Sediment budget ; Semi-arid area ; Simulation ; Soil erosion ; Watershed
The SHETRAN physically based, spatially distributed model is used to investigate the scaling relationship linking specific sediment yield to river basin area, for two contrasting topographies of upland and more homogeneous terrain and as a function
of sediment source, land use and rainfall distribution. The sediment yield/basin area relationship can be inverse or direct, depending on basin characteristics. There still remains, therefore, considerable scope for defining a universal scaling law
for sediment yield.

An econometric analysis of yield variability in paddy production

An econometric analysis of yield variability in paddy production
Céréale ; Géographie humaine ; Modèle économétrique ; Rendement agricole ; Riz

Modelling bedload yield in braided gravel bed rivers

Modelling bedload yield in braided gravel bed rivers
Capacité de charge ; Charge solide ; Chenal anastomosé ; Cours d'eau ; Débit ; Gravier ; Géométrie hydraulique ; Modèle ; Modèle numérique ; Nouvelle-Zélande ; South Island
Braided channel ; Carrying capacity ; Channel geometry ; Discharge ; Gravel ; Model ; New Zealand ; Numerical model ; Sediment load ; South Island ; Stream
This paper outlines an approach for estimating the annual bedload yield of a braided channel. This procedure is based on the extension of the theory of flow and sediment transport in braided rivers recently presented by Paola (1996). The potential
for using such an approach to quantify the relationship between bedload yield and stream morphology is investigated herein with reference to the Waimakariri River, New Zealand.

System model of daily sediment yield

System model of daily sediment yield
Analyse spectrale ; Corrélation ; Débit solide ; Ecoulement ; Estimation ; Géographie physique ; Hydrologie mathématique ; Hydrologie stochastique ; Modèle ; Modèle d'entrée-sortie ; Statistique

Factors controlling sediment yield from small intensively cultivated catchments in a temperate humid climate

Factors controlling sediment yield from small intensively cultivated catchments in a temperate humid climate
Bassin-versant ; Belgique ; Bilan sédimentaire ; Erosion des sols ; Modèle ; Régression multiple ; Sol cultivé ; Zone tempérée
Belgium ; Cultivated land ; Model ; Multiple regression ; Sediment budget ; Soil erosion ; Temperate zone ; Watershed
variation in observed sediment yield. A multiple regression model including 3 morphological catchment properties is a valuable tool to predict total sediment yield from catchments in central Belgium. This model has an efficiency of 0.81. The importance
of spatially distributed parameters within catchments are some of the major reasons that the proposed model does not explain all observed variation in sediment yield.
Data on sediment yield from 26 small cultivated catchments (10-10 000 ha) in central Belgium were collected based on sedimentation rates in small flood retention ponds. Various catchment properties were analysed in order to understand the large

Measurement of sediment yields in Erosion and sediment yield : some methods of measurement and modelling.

Measurement of sediment yields in Erosion and sediment yield : some methods of measurement and modelling.
The SLEMSA (Soil Loss Estimator for Southern Africa) is a mathematical modelling approach, the purpose of which is to bring together all sources of information into a formal arrangement representing the best advice available. One such model has been

Regression agromet yield forecasting models in Remote sensing application in agriculture and hydrology.

Regression agromet yield forecasting models in Remote sensing application in agriculture and hydrology.
Agrométéorologie ; Blé ; Géographie humaine ; Modèle théorique ; Méthodologie ; Parcelle expérimentale ; Production végétale ; Prévision ; Récolte ; Régression multiple

Sensitivity of corn and soybean yield in Illinois to air temperature and precipitation : the potential impact of future climate change

Sensitivity of corn and soybean yield in Illinois to air temperature and precipitation : the potential impact of future climate change
Agroclimatologie ; Changement climatique ; Circulation atmosphérique ; Etats-Unis ; Illinois ; Impact ; Maïs ; Modèle ; Production agricole ; Précipitation ; Prévision ; Soja ; Sécheresse ; Température
Agricultural production ; Agroclimatology ; Atmospheric circulation ; Climatic change ; Drought ; Forecast ; Illinois ; Impact ; Maize ; Model ; Precipitation ; Soya bean ; Temperature ; United States of America
By identifying specific monthly climate variables (mean daily temperature and precipitation) to which corn and soybean yield is sensitive, this study compares monthly regional General Circulation Model (GCM) predictions with the monthly climate
variables to which corn and soybean yield is sensitive to predict crop yield under future climate. Given the regional GCM prediction for increased summer temperatures and summer drought, both corn and soybean yield will likely decrease under future climate

Physiographically controlled allometry of specific sediment yield in the Canadian Cordillera : a lake sediment-based approach

Physiographically controlled allometry of specific sediment yield in the Canadian Cordillera : a lake sediment-based approach
Bassin-versant ; Bilan sédimentaire ; British Columbia ; Canada ; Charge en suspension ; Modèle ; Montagne ; Sédiment lacustre ; Sédimentologie ; Transfert sédimentaire
British Columbia ; Canada ; Lacustrine sediment ; Model ; Mountain ; Sediment budget ; Sediment transfer ; Sedimentology ; Suspended load ; Watershed
estimates of long-term sediment yield, sub-regional patterns of specific yield have been investigated for the Canadian Cordillera. The results suggest that no single model of sediment yield is adequate to describe sediment transfer processes in the Canadian
It is generally supposed that specific sediment yield declines as the drainage basin area increases, as part of the mobilized sediment becomes trapped in the downstream cascade of storage zones. Using a larger data set of lake sediment-based

Reservoir trap efficiency in Erosion and sediment yield : some methods of measurement and modelling.

Reservoir trap efficiency in Erosion and sediment yield : some methods of measurement and modelling.

Climate-crop regression yield model: an appraisal in Application of remote sensing to agricultural production forecasting.

Climate-crop regression yield model: an appraisal in Application of remote sensing to agricultural production forecasting.

The effect of meteorological factors on crop yields and methods of forecasting the yield.

The effect of meteorological factors on crop yields and methods of forecasting the yield.
Agriculture ; Agroclimatologie ; Betterave à sucre ; Biomasse ; Cacao ; Café ; Canne à sucre ; Climat ; Coton ; Ecologie quantitative ; Géographie physique ; Modèle ; Modèle mathématique ; Oléagineux ; Phénologie ; Plante cultivée ; Pomme de terre

Advances in crop yield assessment in the Sahel using remote sensing data

Advances in crop yield assessment in the Sahel using remote sensing data
AVHRR ; Africa ; Agriculture ; Arid area ; Cereal ; Crop yield ; Food security ; Model ; NOAA ; Remote sensing ; Sahel ; Senegal ; Vegetation index
AVHRR ; Afrique ; Agriculture ; Céréale ; Domaine aride ; Indice de végétation ; Modèle ; NOAA ; Rendement agricole ; Sahel ; Sécurité alimentaire ; Sénégal ; Télédétection
This paper aims at assessing the present state of satellite remote sensing assessment of crop yields in the Sahel in the supprot of economic planing as well as natural resource management at a national level. Experiences from Senegal have shown
that a linear relation can be established between millet grain yield collected in the field and vegetation index data, NDVI, integrated during the period where the millet grains are produced. Furthermore, a second objective is to highlight the advantages
associated with remote sensing crop yield monitoring.

Soil loss estimation : a modelling technique in Erosion and sediment yield : some methods of measurement and modelling.

Soil loss estimation : a modelling technique in Erosion and sediment yield : some methods of measurement and modelling.
Erosion des sols ; Erosion hydrique des sols ; Erosion pluviale ; Géographie physique ; Modèle mathématique ; Modélisation ; Montagne ; Sol cultivé ; Zimbabwe ; Zone intertropicale

Modelling the inter-annual variability of sediment yields : A case study for the upper Lech River

Modelling the inter-annual variability of sediment yields : A case study for the upper Lech River
Allemagne ; Années 1924-2003 ; Bassin-versant ; Bayern ; Bilan sédimentaire ; Hydroclimatologie ; Lech ; Modèle ; Montagne ; Précipitation ; Variabilité interannuelle
Bavaria ; Germany ; Hydroclimatology ; Interannual variability ; Model ; Mountain ; Precipitation ; Sediment budget ; Watershed
The AA. developed a parsimonious approach to model the climate forcing on sediment yields in a mountainous Austrian–German river catchment. The hydro-climatologic forcing was interpreted by the novel RAMSES (RAinfall Model for SEdiment yield
Simulation) approach to estimate the annual sediment yields. The AA. used annual data on suspended-solid yields at the gauge Füssen, monitored from 1924 to 2003, and monthly rainfall data. The dataset was split into the period 1924–1969 for calibration
- to inter-decadal variability of sediment yields in river catchments where detailed precipitation records are not available as well as for the reconstruction of historical sediment yields.

Odvození topografických charakteristik pro ǘčely precizního zemĕdĕlství

Agriculture ; Crop yield ; Czech Republic ; Digital elevation model ; Model ; Slope evolution ; Topography
Agriculture ; Evolution de versant ; Modèle ; Modèle numérique de terrain ; Rendement agricole ; Tchèque république ; Topographie
sources (combine yield monitor, RTK-GPS and data from airborne laser scanning). The models of topographical characteristics were compared with crop yields during the observed period of 2004–2012, in order to determine which data source is best
This paper deals with the prospects of modelling topographic features – digital elevation models and slope models for an experimental plot with an area of 11.5 hectares. The basis for the creation of these models is formed by data from various
for the evaluation of the influence topography holds over yield values. Data from airborne laser scanning turned out to be the most suitable dataset for the tasks, because of their sufficient accuracy and frequency. - (EN)

Production potential and yield gaps of summer maize in the Beijing-Tianjin-Hebei Region

Production potential and yield gaps of summer maize in the Beijing-Tianjin-Hebei Region
Agroclimatologie ; Beijing ; Chine ; Chine de l'Est ; Céréale ; Domaine semi-aride ; Hebei ; Irrigation ; Maïs ; Modèle ; Production agricole ; Ressource en eau ; Système d'information géographique ; Tianjin ; Utilisation du sol
Agricultural production ; Agroclimatology ; Beijing ; Cereal ; China ; Eastern China ; Geographical information system ; Hebei ; Irrigation ; Land use ; Maize ; Model ; Semi-arid area ; Tianjin ; Water resources
This study firstly simulated the potential and waterlimited yield of summer maize in the Beijing-Tianjin-Hebei (BTH) region using WOFOST model with meteorological data of 40 years, and then analyzed yield gaps between the actual and potential yield
based on statistical data at county level. The simulated yields gradually decrease from northeast to southwest with changes in climatic conditions particularly temperature and precipitation. Annual variation of potential yield is higher in the central
and southern parts than the northeastern part. Compared to potential yield, the water-limited yield has higher coefficient of variation (CV), because of precipitation effects. The study results can be used for land use planning and should promote the growing

Predicting catchment sediment yield in Mediterranean environments : the importance of sediment sources and connectivity in Italian drainage basins

Predicting catchment sediment yield in Mediterranean environments : the importance of sediment sources and connectivity in Italian drainage basins
Bassin-versant ; Bilan sédimentaire ; Domaine méditerranéen ; Erosion des sols ; Glissement de terrain ; Italie ; Modèle ; Prévision
Forecast ; Italy ; Landslide ; Mediterranean area ; Model ; Sediment budget ; Soil erosion ; Watershed
sediment delivery rates with increasing catchment area. Furthermore, this positive relation suggests that processes other than upland erosion are responsible for catchment sediment yield. Here, the AA. explore the potential of the Factoring Scoring Model
(FSM) and the Pacific Southwest Interagency Committee (PSIAC) model to predict sediment yield and indicate the most important sediment sources.
From reservoir sedimentation data of 44 Italian catchments, it appeared that there was a (non-significant) positive relation between catchment area and sediment yield. This is in contrast to what is generally expected from the theory of decreasing

Modelling water erosion and the impact of water repellency

Modelling water erosion and the impact of water repellency
Dune ; Erosion des sols ; Géographie physique ; Humidité du sol ; Littoral ; Modèle ; Pays-Bas ; Perméabilité ; Précipitation ; Ruissellement
Three years of weekly measurements of surface runoff and sediment yield from two small plots in a dune terrain along the Dutch coast have been used to model water erosion. This paper tries to establish simple estimates of sediment yield as well

Résultats de la recherche (822 résultats)

Affinez votre recherche