Estimation of Crop Evapotranspiration by Using the Penman-Monteith Method with a Variable Canopy Resistance

Vegetation-Induced Drag: An Experimental Study
Open-channel flow models through vegetative canopies require a quantitative measure of the ability of plants to absorb momentum by form drag, which is commonly characterized in terms of...

The Effect of Beach Vegetation on Aeolian Sand Transport
The effect of coastal vegetation on aeolian sand transport is examined through consideration of the governing aerodynamic processes. Local scale processes without the effect of ground...

Lysimeter Studies in Irrigated Soils of South Eastern Australia
The Riverine Plain of south eastern Australia is an extensive, predominantly clay soil area with large surface irrigation schemes. Early lysimeter installations were used to estimate evaporative...

Predicting Effects of Modifying Tussock Grassland
Measurements of rainfall, drainage, and weight change of a 6 m2 surface area cylindrical lysimeter containing nine snow tussocks (Chionochloa rigida)...

Effect of Frequency on Center Pivot Irrigation
Processes that are affected by the irrigation frequency of center pivot irrigation systems are described. High frequency irrigation will increase evaporation from crop canopies and unshaded...

Crop Canopy Models for Estimating Evapotranspiration from Row Planted Field
To evaluate the consumptive use efficiency of irrigated water, it is useful to estimate the soil surface evaporation component separately from the transpiration component. Interception...

Effects of Forest Cover on a Snowpack in the Sierra Nevada
Adjacent snowpacks in a clearing and under a forest canopy were compared over a decade at a site near Lake Tahoe. This comparison provides a few indications of the differences in snowpack...

An Assessment of Input Variables to the Penman-Monteith Equation Using Canopy Reflectance Measurements
Observing the form of the Penman-J.L. Monteith equation, it can be seen that several terms could be potentially estimated from remotely sensed data. These include: net radiation, canopy...

Soil Erosion and Sediment Transport Modeling on Small Tropical Watersheds
A fundamentally-based concept of a soil erosion and sediment transport model in a forest tropical area is presented. It will be incorporated to the ANSWERS model. The forest hydrology...

Bulk Stomatal Resistance in Operational Estimates of Evapotranspiration
General relationships for estimating canopy or bulk stomatal resistance and aerodynamic resistances of grass and alfalfa reference crops for use in the Penman-J.L. Monteith equation are...

Modeling of Turbulent Canopy Flow

Control of Adverse Wind Near Buildings
The characteristics of basic flow modules associated with an isolated building, a fence and building combination, and a building with various canopies in a simulated atmospheric boundary...

Wind-Driven Flow of Water Influenced by a Canopy
A time-dependent numerical model, which treats fully evolved wind-driven canopy flow as a coupled two-layer system, is developed. The interfacial stress is formulated in terms of a coupling...

Functions to Predict Optimal Irrigation Programs
Davis, Calif., programming dates and depths of irrigations are based on comparison of the estimated sequence of maximum evapotranspiration rates (ETmax...

 

 

 

 

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