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GEOS4499: Catchment Fundamentals- Catchment Processes Laboratory- Simulation Assignment Help
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Internal Code: TOA97
Step 1. Set up the experimental apparatus, Mary-Anne will help you with this. Make sure you take notes so that you can adequately describe your experimental setup in your report.
Step 2. Measure the properties of the system prior to rainfall
2.1 Gravimetric water content (later to be converted to volumetric water content based on the bulk density). Measure this by taking a sample of the soil added, putting in a pie tin of known weight, weighing the soil and tin, drying at 105 ? for 24hrs, reweighing, finding the weight difference (ml of water) dividing by the weight of sample before drying (g total soil) . Remember that gravimetric water content has units of mL g-1
2.2. Sampling containers. You need to label and pre-weigh the containers you will use for runoff and rainfall collection. You will also need to measure the inlet surface area for rainfall collection containers so that you can scale your measurements properly.
2.3 The slope of the soil in the catchment.
2.4 Assign roles. You will need a designated time-keeper and people to handle the samples. You will manually retrieve the rainfall and runoff (plus soil) samples collected over 30 sec intervals, but only once per minute. Make sure you know what you’re doing here before you start the rainfall!
Step 3. Now you’re ready to turn on the rainfall and collect your samples. You will need to take these inside to measure weights and water contents.
Step 4. Post-rainfall volumetric water content. Get a bulk density ring. Measure the volume within the ring. Press the ring into the soil then dig around the ring and transfer the contents only into a pre-weighed pie tin. Weigh tin and soil, place into 105 ? for 24 hrs. Re-weigh soil. Bulk density (g/cm3) is mass of dry soil (post oven g) per unit of volume (divided by the volume measured in cm3).
Volumetric water content (mL cm-3) is calculated by taking the water volume lost during drying (mL) and divided by the measured volume of the ring (cm3).
Step 5. You can use the tables below as templates for your data collection. Once you have your measured data you will need to make appropriate plots of rainfall and runoff over time, and discuss your results.
Simulation Assignment Help:
Experiment - Runoff generation mechanisms This experiment is conducted outside and uses the rainfall simulator to examine the processes of infiltration excess and saturation excess for generating runoff. You will begin the experiment by setting up the apparatus. You have two types of soil to test, each with different grainsize distributions and hydraulic properties. You will manually measure the amount of runoff generated from each soil, and compare the processes of runoff generation. During the experiment you will measure: rainfall (mm cm-2), runoff (mL cm-2) and soil erosion (g cm-2). Runoff on soil occurs for 2 reasons, either infiltration excess or saturation excess. Infiltration excess occurs when water is applied to the soil at a greater rate than it is able to infiltrate. Saturation excess is when there is so much infiltration that all soil pores are filled and therefore runoff occurs. The relative contributions of these two processes to runoff within a catchment depends on a number of factors that can include rainfall intensity, soil hydraulic properties and terrain. In this experiment you compare runoff generation in two different soil types; one is a clean sand and the other is a clayey soil.
Step 1. Set up the experimental apparatus, Mary-Anne will help you with this. Make sure you take notes so that you can adequately describe your experimental setup in your report.
Step 2. Measure the properties of the system prior to rainfall
2.1 Gravimetric water content (later to be converted to volumetric water content based on the bulk density). Measure this by taking a sample of the soil added, putting in a pie tin of known weight, weighing the soil and tin, drying at 105 ? for 24hrs, reweighing, finding the weight difference (ml of water) dividing by the weight of sample before drying (g total soil) . Remember that gravimetric water content has units of mL g-1
2.2. Sampling containers. You need to label and pre-weigh the containers you will use for runoff and rainfall collection. You will also need to measure the inlet surface area for rainfall collection containers so that you can scale your measurements properly.
2.3 The slope of the soil in the catchment.
2.4 Assign roles. You will need a designated time-keeper and people to handle the samples. You will manually retrieve the rainfall and runoff (plus soil) samples collected over 30 sec intervals, but only once per minute. Make sure you know what you’re doing here before you start the rainfall!
Step 3. Now you’re ready to turn on the rainfall and collect your samples. You will need to take these inside to measure weights and water contents.
Step 4. Post-rainfall volumetric water content. Get a bulk density ring. Measure the volume within the ring. Press the ring into the soil then dig around the ring and transfer the contents only into a pre-weighed pie tin. Weigh tin and soil, place into 105 ? for 24 hrs. Re-weigh soil. Bulk density (g/cm3) is mass of dry soil (post oven g) per unit of volume (divided by the volume measured in cm3).
Volumetric water content (mL cm-3) is calculated by taking the water volume lost during drying (mL) and divided by the measured volume of the ring (cm3).
Step 5. You can use the tables below as templates for your data collection. Once you have your measured data you will need to make appropriate plots of rainfall and runoff over time, and discuss your results.