QUESTION 2!!!!! NOT 1
1. To analyze a relationship between water content and hydraulic properties of a partially saturated soil, the soil parameters were determined from a lab as follows. Porosity 0.40 Residual soil water contents Saturated hydraulic conductivity 0.10 10 cm/h For the following tasks, use the van Genuchten model with n=3.0 and a = 0.05 cm-?. Assume a range of matric suction from 0 to 200 cm with an increment 20 cm. Use a log scale if needed for better visualization. Clearly present the equations used in calculations. (1) Compute and plot water content in x-axis vs. matric suction| (cm) in y-axis (2) Compute and plot water content in x-axis vs. hydraulic conductivity (cm/h) in y-axis (3) Compute and plot |matric suction| (cm) in x-axis vs. hydraulic conductivity (cm/hr) in y-axis 2. Matric suction was measured in a field site as follows. Assuming that the soil parameters are same as Question 1, perform the following tasks. Depth, cm 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 Suction, cm -240 -220 -150 -133 -115 -90 -81 -73 -60 -51 -43-35 -30 -12 -5 0 (1) Plot a profile for water content in x-axis vs. depth (cm) in y-axis. Use the Brooks-Corey model with a fitting parameter (2) = 2.5 and air-entry pressure head =-10 cm for the depth-water content profile. (2) Plot a profile for water content in x-axis vs. depth (cm) in y-axis. Use the van Genuchten model with the parameters provided in Question 1. (3) Compare the total water volume (cm) held in this soil profile per unit surface area (1 m) using two models (Hint: Compute average water content between two depths and repeat for all depth intervals. Then the sum of [average water content x depth interval] is the available water volume per unit area. 1. To analyze a relationship between water content and hydraulic properties of a partially saturated soil, the soil parameters were determined from a lab as follows. Porosity 0.40 Residual soil water contents Saturated hydraulic conductivity 0.10 10 cm/h For the following tasks, use the van Genuchten model with n=3.0 and a = 0.05 cm-?. Assume a range of matric suction from 0 to 200 cm with an increment 20 cm. Use a log scale if needed for better visualization. Clearly present the equations used in calculations. (1) Compute and plot water content in x-axis vs. matric suction| (cm) in y-axis (2) Compute and plot water content in x-axis vs. hydraulic conductivity (cm/h) in y-axis (3) Compute and plot |matric suction| (cm) in x-axis vs. hydraulic conductivity (cm/hr) in y-axis 2. Matric suction was measured in a field site as follows. Assuming that the soil parameters are same as Question 1, perform the following tasks. Depth, cm 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 Suction, cm -240 -220 -150 -133 -115 -90 -81 -73 -60 -51 -43-35 -30 -12 -5 0 (1) Plot a profile for water content in x-axis vs. depth (cm) in y-axis. Use the Brooks-Corey model with a fitting parameter (2) = 2.5 and air-entry pressure head =-10 cm for the depth-water content profile. (2) Plot a profile for water content in x-axis vs. depth (cm) in y-axis. Use the van Genuchten model with the parameters provided in Question 1. (3) Compare the total water volume (cm) held in this soil profile per unit surface area (1 m) using two models (Hint: Compute average water content between two depths and repeat for all depth intervals. Then the sum of [average water content x depth interval] is the available water volume per unit area
