جستجوی مقالات مرتبط با کلیدواژه « infiltration » در نشریات گروه « مکانیزاسیون کشاورزی »

A relatively large number of field measurements are required to accommodate the spatial and temporal variability of the soil infiltration characteristics needed to express field conditions. Scaling is a recently-developed method that reduces the data needed to determine infiltration parameters. The present study evaluated the use of scaling to estimate infiltration parameters for variable alternate furrow irrigation and fixed alternate furrow irrigation methods that uses a single advance time and model infiltration curve to determine infiltration parameters. Field data from seven irrigation events during the maize growing season in clay loam soil in Karaj, Iran was used to evaluate scaling for both irrigation methods. The relative error for estimation of total infiltration was 1.44% to 20.03% for fixed and 0.48% to 13.80% for variable alternate furrow irrigation. No significant difference was observed between the measured and scaled data for infiltration.

Soil condition and type of land use are the most important factors that directly determine soil infiltration rate and hence, control the creation of flood in watershed. In other words, the Curve number of each watershed shows its hydrological behavior and water regime during precipitations. This study was carried out on Maraveh-Tappeh watershed, Golestan province and its main object was produce the curve number map for the study area. Using GIS, the average weighted curve number of the watershed was 77 in humidity level of grade II and major part of the watershed area had curve number of 79. Results revealed that, the maximum number of curves during mean humidity reaches up to 97 and the minimum number to 60. Accordingly, high number of weighted average curve number could be an evident of low infiltration rate of watershed and increasing probability of flood occurrence owing to loess soil. In order to reduces water resources loss, it is necessary to implement basic practices at watershed in line with increasing of water infiltration rate and establishing water harvesting systems including pitting and contour furrow, combined with vegetation increasing projects such as seeding and shrub planting. Additionally, using the current curve number map and consideration to precipitation regime of the watershed, sustainable development plans for water resources management can be implemented and hence some solutions may be presented to manage water tensions and to control floods in this watershed.