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2 edition of Evapotranspiration and soil moisture in upland grass catchments in the eastern Pennines found in the catalog.

Evapotranspiration and soil moisture in upland grass catchments in the eastern Pennines

John G. Lockwood

Evapotranspiration and soil moisture in upland grass catchments in the eastern Pennines

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Published by University of Leeds, Dept. of Geography in Leeds .
Written in English


Edition Notes

StatementJ.G. Lockwood and K. Venkatasawmy.
SeriesWorking paper / University of Leeds, Department of Geography -- no.99
ContributionsVenkataswamy, K.
ID Numbers
Open LibraryOL14848751M

Importance of soil moisture measurements for inferring parameters in hydrologic models of low-yielding ephemeral catchments S.A. Wooldridge a,∗, J.D. Kalma a, J.P. Walker b a Department of Civil, Surveying and Environmental Engineering, The . GRASS REFERENCED BASED VEGETATION COEFFICIENTS FOR ESTIMATING EVAPOTRANSPIRATION FOR A VARIETY OF NATURAL VEGETATION Daniel J. Howes, Ph.D., P.E.1 Mariana Pasquet2 ABSTRACT In arid and semi-arid regions, evapotranspiration from vegetation results in the significant utilization of available water. Effects of evapotranspiration partitioning, plant water stress response and topsoil removal on the soil moisture regime of a floodplain wetland: implications for restoration Author: Booth, Eric G., Loheide, Steven P. II. Source: Hydrological processes v no pp. ISSN: Subject:Cited by: hydropedological purposes. All the soil properties which might influence or be influenced by the hydrology were identified and related to hydrological hillslope response. These properties include: soil type, soil depth, weathering of underlying material, and presence of CaCO 3.


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Evapotranspiration and soil moisture in upland grass catchments in the eastern Pennines by John G. Lockwood Download PDF EPUB FB2

Evapotranspiration and soil moisture in upland grass catchments in the eastern Pennines. Hydrol., Simple mathematical models are used to investigate the mean moisture states and the actual evapotranspiration from two small Author: J.G. Lockwood, K.

Venkatasawmy. Evapotranspiration The term evapotranspiration (ET) is defi ned as the water vapour produced from the watershed as a result of the growth of plants in the watershed. Evapotranspiration and consumptive use include both the transpiration by vegetation and evapora-tion from free surfaces, soil, snow, ice and Size: KB.

John G. Lockwood has written: 'Evapotranspiration and soil moisture in upland grass catchments in the eastern Pennines' 'A mathematical model of. The soil water reservoir balances the episodic excesses of water supply from rainfall against the more smoothly varying atmospheric demand for evapotranspiration.

The role of soil moisture within the soil–plant–atmosphere system depends on the soil moisture reservoir size and the availability of water in that reservoir, which, in turn. Observed relation between evapotranspiration and soil moisture in the North American monsoon region Enrique R.

Vivoni,1 Hernan A. Moreno,1 Giuseppe Mascaro,1 Julio C. Rodriguez,2 Christopher J. Watts,3 Jaime Garatuza-Payan,4 and Russell L.

Scott5 Received 16 September ; revised 13 October ; accepted 16 October ; published 26 November Measurement and Simulation of Evapotranspiration at a Wetland Site in the New Jersey Pinelands. By David M. Sumner, Robert S. Nicholson, and Kenneth L. Clark Prepared in cooperation with the New Jersey Pinelands Commission.

Scientific Investigations Report – U.S. Department of the Interior U.S. Geological SurveyCited by: 3. The Pennines are a low-rising mountain range in Northern England and Southern Scotland. SOIL MOISTURE CONTENT AND EVAPOTRANSPIRATION W.C. VISSER Institute for Land and Water Management Research, Wageningen, the Netherlands SUMMARY The moisture content at which the évapotranspiration decreases with a certain percentage — be it high or low — depends on the evaporative capacity of the Size: KB.

Dryland shrubs: understanding their effects on local hydrology and rainfall partitioning. Evapotranspiration and soil moisture in upland grass catchments in the eastern : David Dunkerley. with the modelling of evapotranspiration and soil moisture. In this study, Surface energy balance algorithm for land (SEBAL) was applied for an estimation of actual evapotranspiration and soil moisture over two key study areas i.e.

the km2 Yanco area including Coleambally Irrigation Area (CIA) and the km2 Kyeamba catchment in the. During a drought, the significance of evapotranspiration is magnified, because evapotranspiration continues to deplete the limited remaining water supplies in lakes and streams and the soil.

The lower 5 miles of the atmosphere transports an average of ab billion gallons of water vapor over the conterminous United States each day (U.S. Evapotranspiration - An Overview contains recent advances in the physics of evaporation and transpiration from a typical experimental site to large scale areas.

It incorporates many years of authors experience with the latest research on the methods and the models used worldwide, engaging advanced technology and modern instrumentation. The reader benefits from the in Cited by: 2. Precipitation, evapotranspiration (ET), and soil moisture are the key controls for the productivity and functioning of temperate grassland ecosystems in Inner Mongolia, northern China.

Quantifying the soil moisture dynamics and water balances in the grasslands is essential to sustainable grassland management under global climate by: 9. The soil moisture under the two vegetation types showed little difference. However, in the dry seasons the forest sustained a higher evapotranspiration rate than the pasture, and the dif- ference was attributed to the ability of the trees to access soil moisture from greater depth.

Calder [] suggested thatCited by: M soil moisture probes and S-TMB-M soil tempera- ture probes (Decagon Devices Inc., Pullman, W A) were in- stalled to measure the soil profile moisture and temperature. Simultaneous measurements of soil moisture profiles and water table heads, along a flow path, were used to determine evapotranspiration (ET) along with other components of the water budget.

The study was conducted at a small-scale (~ Km 2) hydrologic monitoring field site in Hillsborough County, Florida, from January to June Cited by: 4. to Sacramento. Evapotranspiration was estimated within the model based on computed root zone soil moisture along with input infor­ mation on leaf-area index, soil properties, and potential evapotran­ spiration (ET) (which was assumed to equal the grass reference evapotranspiration for that study).

The potential ET was estimated. Other tools, like soil moisture sensors, can inform you about only one facet of the SPAC. Evapotranspiration integrates the SPAC – and accomplishes this over a broad area of a crop field.

If there is insufficient water available in the soil, then the ET will decrease as the plants physiologically regulate their water use. Available soil moisture, the relative amount of water in the soil between a lower limit, called the wilting point, and an upper limit, known at the field capacity, was estimated from the mean monthly rainfall of the current month and the previous month.

A functional relationship was established based on observed and modeled soil moisture and. A fundamental problem in ecohydrology is diagnosing impacts of vegetation dynamics on the catchment response. This study uses a distributed hydrologic model and remote sensing data to evaluate the effects of seasonal vegetation greening on the basin water balance and the partitioning of evapotranspiration ET into soil evaporation, transpiration, and Cited by: Evapotranspiration and near-surface soil moisture dynamics are key-entangled variables regulating flux at the surface-atmosphere interface.

Both are central in improving mass and energy balances in agro ecosystems. However, under the extreme conditions of high-latitude soils and weather pattern variability, the implementation of such coupled liquid and vapor phase Author: Watcharee Ruairuen, Gilberto J. Fochesatto, Marco Bittelli, Elena w, Mingchu Zhang, William.

The reason is the low hydraulic conductivity of the soil due to low soil water potential in the soil root zone. Then the evapotranspiration rate is less than the potential one, and the relationship between evapotranspiration rate and soil water potential of the root zone can be found and applied to calculate actual : Viliam Novák.

At each site, we used 30‐min volumetric soil moisture (θ in % at 5 cm) and evapotranspiration (mm/day) from the eddy covariance method (EC) to derive daily values of the ET‐θ relation.

Soil moisture depths were selected based on available data and for consistency with tight coupling of soil moisture control and the surface energy balance. which the effect of soil on evapotranspiration is taken into consideration. Thorn-thwaite’s original model was modified in two aspects: 1.

In addition to potential evapotranspiration, actual evapotranspiration was also calculated and 2. in the calculation of the available moisture content of soil, soil texture was also taken into account. BASICS OF EVAPORATION AND EVAPOTRANSPIRATION Turf Irrigation Management Series: I Paul W.

Brown water lost through soil evaporation passes directly from the soil to the atmosphere. Evapotranspiration data are usually presented as a depth of water loss over a particular time period in a in the grass reference or changes in soil moisture.

Measurement of Evapotranspiration Across Different Land Cover Types in the Greater Toronto Area Final Report Page ii THE SUSTAINABLE TECHNOLOGIES EVALUATION PROGRAM The Sustainable Technologies Evaluation Program (STEP) is a multi-agency program, led by the Toronto and Region Conservation Authority (TRCA).

Access the full text NOT AVAILABLE. Lookup at Google Scholar. the evapotranspiration from an extensive surface of green grass of uniform height, actively growing, well-watered, and completely shading the ground”.

In the reference evapotranspiration definition, the grass is specifically defined as the reference crop and this crop is assumed to be free of water stress and diseases.

In the literature, theCited by: Where, u is the water use from the root zone for successive sampling periods or within one irrigation cycle (mm), n is the number of soil layers sampled in the root zone depth D, M 1i and M 2i are the soil moisture percentage at the time of the first and second sampling in the i th layer respectively, A i is the apparent specific gravity of the.

Environmental drivers of evapotranspiration in a shrub wetland and q is soil moisture. Formulations such as equation (3) are not strictly mechan- phenological changes in leaf area, evapotranspiration in the upland varies between radiation driven and vapor pressure.

Evapotranspiration Rate Measurements of Vegetation proposed to utilize the ground-water resources of rural basins in eastern and central Nevada. Municipal, land management, and regulatory agencies have expressed concerns about potential soil moisture measured at ET sites, Basin and Range carbonate-rock aquifer system study area, Nevada File Size: 3MB.

The daily evapotranspiration patterns for paspalum, lucerne, and bare soil in Fig. 1 illustrate the technique. The leafy pas-palum and lucerne swards (LA1 exceeds ) transpired rapidly with a water use of to mm/day, whereas bare soil evapotranspiration fell from mm/day to mm/day as the soil surface dried.

This book covers topics on the basic models, assessments, and techniques to calculate evapotranspiration (ET) for practical applications in agriculture, forestry, and urban science. This simple and thorough guide provides the information and techniques necessary to develop, manage, interpret, and apply evapotranspiration ET data to practical.

This paper examines several methods used to estimate evapotranspiration from native vegetation, including the use of vegetation coefficients (K v).

Vegetation coefficients are based on a standardized reference and are computed as the ratio of vegetation evapotranspiration (ET v) to the grass reference evapotranspiration (ET o). soil moisture were from the surface soil [Betts and Ball, ; Eltahir, ].

This relationship has not been tested with ET and soil moisture data from semiarid environ-ments (Table 1). The controls on ET from soil moisture should be greatest in these locations, and therefore the model should be considered a hypothesis that must be tested.

Evapotranspiration in the forest (E forest) is a complicated physical process. It includes transpiration by the green mass of the tree crowns (E tr), evaporation from the soil and by ground vegetation (E s), and evaporation of intercepted precipitation (E p).

The techniques of evaluating each kind of evaporation are quite different. eastern Nevada. A symmetric complementary relationship between the potential LE (LE p) and actual LE is extremely attractive because it is based on general feedback mechanisms where detailed knowledge of the complex processes and interactions between soil, vegetation, and the near‐surface boundary layer can be avoided.

Analysis of computed LE. The proper assessment of evapotranspiration and soil moisture content are fundamental in food security research, land management, pollution detection, nutrient flows, (wild-) fire detection, (desert) locust, carbon balance as well as hydrological modelling; by: 20 three main sources of soil, vegetation surface or atmosphere (Burt et al., ).

Soil evaporation is affected by soil moisture status, soil physical and chemical character-istics, tilth conditions, soil cover (e.g. mulch), and ecological parameters. Evaporation of vegetation surface is influenced by vegetation type, species, canopy cover.

Using climatological, soil, and plant data, an attempt has been made to calculate the moisture status of a soil under a permanent grass cover. It has been shown that it is insufficient to use formulas which estimate potential evapotranspiration only, such as those of Thornthwaite, Blaney and Criddle, or by:.

While the soil moisture measurements in the study ended in early June, the soil moisture was still declining, indicating continued evapotranspiration.

The vernal pool K v was estimated based on aquatic (open water) areas in the winter (December through February) and large-stand wetlands in the spring (March through May). Abstract.

Water consumed through evapotranspiration (ET) impacts local and regional hydrologic regimes on various spatial and temporal scales. Estimating ET in the Great Plains is a prerequisite for effective regional water resource management of the Ogallala (High Plains) Aquifer, which supplies vital water resources in the form of irrigation for extensive Cited by: 5.Calculation of actual evapotranspiration is very complex when soil moisture is limited.

ET a values are estimated from ET m based upon soil moisture, overall climatic conditions, soil salinity, depth of ground water table, and agronomic and irrigation practices. Reference crop ET must be compatible with the crop coefficients that are to be used.