Search results for "Hydrus"
showing 7 items of 17 documents
Using Hydrus 2-D to assess the emitters optimal position for Eggplants under surface and subsurface drip irrigation
2014
The main objective of the work is to assess the emitters optimal position for Eggplant crop (Solanum melongena L.) in a sandy loam soil irrigated with surface or subsurface drip irrigation systems, by means of field measurements and simulations carried out with Hydrus-2D model. Initially, the performance of the model is evaluated on the basis of the comparison between simulated soil water contents (SWC) and the corresponding measured in two plots, in which laterals with coextruded emitters are laid on the soil surface (T0) and at 20 cm depth (T20), respectively. In order to choose the best position of the lateral, the results of different simulation runs, carried out by changing the install…
Closure to Using Hydrus 2-D Simulation Model to evaluate Wetted Soil Volume in Subsurface Drip Irrigation Systems.
2008
CARATTERIZZAZIONE MULTISCALA DEL SISTEMA SPA PER LA MODELLAZIONE IDROLOGICA DEI CONSUMI EVAPOTRASPIRATIVI EFFETTIVI
L’incremento demografico mondiale degli ultimi decenni ha determinato una crescente richiesta di risorse idriche sia per usi civili ed industriali, che per l’agricoltura. Si stima, infatti, che nel 2030 il progressivo aumento della domanda di risorse idriche determinerà la difficoltà di accesso per circa metà della popolazione del pianeta (WWAP, 2012), soprattutto nelle regioni caratterizzate da climi aridi o semiaridi. I problemi connessi alla carenza di risorse idriche sono particolarmente rilevanti in agricoltura che, a scala globale, utilizza attualmente il 70% dell’intero utilizzo delle acqua proveniente dai corpi idrici superficiali e sotterranei (WWAP, 2014). L’uso finale di tali ris…
A Comprehensive Model for Hydraulic Analysis and Wetting Patterns Simulation under Subsurface Drip Laterals
2022
In the absence of suitable specialized models to simulate the soil wetting patterns in subsurface drip irrigation systems considering the hydraulic conditions along the laterals, a new model was developed and named a “comprehensive model” in this study. This model couples the subsurface drip irrigation lateral characteristics with the soil hydraulic properties and utilizes the Hydrus-3D software as a complementary section of the model to simulate the wetting front beneath the lateral. To evaluate the model, three 16 mm drip-line pipes of 62 m length with 20, 40, and 50 cm spacing emitters and 2 to 5 L/h discharge were buried at 0.2 m depth in a soil box containing clay loamy soil. Then, the…
Assessing HYDRUS-2D model to simulate water content and salt accumulation in a soil irrigated with a subsurface drip system: Application in a semiari…
2015
In this paper, the suitability of HYDRUS-2D model to predict the average soil water content in the root zone of potato crop irrigated with subsurface drip irrigation plant, is initially assessed on the basis of a field study. Then, the model is tested to predict the salt distribution around a buried emitter, when two different water qualities (i.e. electrical conductivity of 1.0 dS m-1 and 4.0 dS m-1), are used during the growing season (treatments T1 and T2). Finally, the soil volume in which salts accumulates, as well as the effects on crop yield is recognized for both the considered treatments.The results evidenced that predicted values of average soil water content in the root zone were…
Assessing the performance of different model-based techniques to estimate water content in the upper soil layer
2016
he knowledge of soil water content (SWC) of the upper soil layer is important for most hydrological processes occurring over vegetated areas and under dry climate. Because direct field measurements of SWC are difficult, the use of different type of sensors and model-based approaches have been proposed and extensively used during the last decade. The main objective of this work is to assess the performance of two models estimating SWC of the upper soil layer: the transient line heat source method and the physically based Hydrus-1D model. The models' performance is assessed using field measurements acquired through a Time Domain Reflectometer (TDR). The experiment was carried out on an olive …
Viendimensionāls gruntsūdens līmeņa modelis Mazuikas ezera ūdens bilances novērtēšanai
2022
Bakalaura darbā paveikta Mazuikas ezera apkārtnes gruntsūdens līmeņa svārstību izpēte ar modelēšanas un simulācijas rīku HYDRUS-1D. Aizsargājamo ainavu apvidū “ĀDAŽI” tika veikti urbšanas darbi, nogulumu paraugu ievākšana, fotografēšana un pazemes ūdens līmeņa konstatēšana. Laboratorijā nogulumu paraugiem tika noteikta daļiņu izmēra sadalījuma sastāvs, kopējais un daļiņu blīvums, porainība, filtrācijas koeficients un organiskās vielas saturs. Tika veikta ūdens svārstību modelēšana un simulēšana ar HYDRUS-1D rīku, kā izejas datus izmantojot lauka un laboratorijas pētījumu rezultātus un E-OBS meteoroloģisko datu kopu. Iegūtais rezultāts tiks izmantots, lai pētītu Mazuikas ezera ūdens līmeņa s…