جستجوی مقالات مرتبط با کلیدواژه "green-ampt model" در نشریات گروه "آبخیزداری، بیابان، محیط زیست، مرتع"

Soil infiltration is one of the key processes in the design of irrigation systems, water resources management, soil conservation, and erosion control in watershed management. As to the importance of the mentioned subject, infiltration changes and modeling were investigated on the surface soil of geological formations in this study. The double-ring infiltrometer was used to measure the infiltration rate in the surface soil of some geological formations on the Alashtar Watershed due to the flooding potential of the area. The performance of the modified Green-Ampt, Philip, Kostiakov, the US Soil Conservation Service (SCS), and the Horton models were evaluated in estimating the infiltration rate in the surface soils formed or deposited on those formations. The results indicated that the Asmari Formation (Oml) had a higher cumulative infiltration, average infiltration rate, terminal infiltration rate than other formations. This was followed by the Quaternary Formations (Q and Qt). The results indicated that the modified Green-Ampt model had an acceptable accuracy as compared to other models in estimating infiltration in the Pabdeh (EL), the Khami Group (Jk, Mz), the Gachsaran (M), the Aghajari (Muplaj, Mpaj), and the Bakhtyari (Plb) Formations with efficiency coefficients of 93.9, 94.4, 95.9, 97.6, 87.7, and 92.7%, respectively. The Kostiakov model was more suitable for the Q and Oml Formations, and the Horton model was the best for the Qt Formation (C.C= 0.925), which may be used to quantify the amount of infiltrated water and to estimate the runoff volume for the soils formed or deposited on those formations different on the mentioned geological formations.

Infiltration of water into the soil is a pant water supply key process. It has also an essential role in controlling surface runoff and groundwater. The objective of this study is to investigate and model the infiltration rate in different vegetation types (Annual Grass- Astragalus rhodoseminus, Astragalus ecbatanus- Euphorbia denticulata, Quercus brantii, Annual Grass). Infiltration rate was measured by double ring infiltrometer (DRI). Three samples were taken from each vegetation type, and infiltration indices and some soil characteristics were measured. One-way ANOVA was used to test the changes in infiltration indices and soil characteristics of different vegetation types and the Pearson correlation coefficient was used to test the relationships between infiltration rates and soil parameters. The performance of Kostiakov, Philip, Horton, Soil Conservation Service (SCS) and modified Green–Ampt models were evaluated by statistical criteria such as Nash-Sutcliffe (NS), efficiency coefficient (EF), root-mean-square error (RMSE), etc. The results showed that silty soil is not similar in different vegetation types. Although the infiltration did not show a significant difference in the vegetation types, the average infiltration rate in the Astragalus ecbatanus- Euphorbia denticulata type was equal to 14.4 cm/h, as the highest and the lowest value was observed in the Annual Grass-Astragalus rhodoseminus type with 6.25 cm/h, so that the former is 2.3 times larger than latter. Correlation results showed that infiltration has the highest relationship with porosity. The modeling result suggests that the modified Green–Ampt has a very high performance for estimating the infiltration rate in Annual Grass- Astragalus rhodoseminus, Astragalus ecbatanus- Euphorbia denticulata, Quercus brantii, annual Grass types with EF of 0.976, 0.945, 0.886, and 0.927, respectively. The results indicate that the infiltration varies in the different vegetation types that should be considered in the management of ground water rechage.