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Methodology
 

Methodology

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    Methodology Methodology Presentation Transcript

    • Methodology
    • What do the examiners say?
    • Hypotheses 1. Channel size or Cross Sectional area will increase with distance downstream. 2. Channel efficiency will increase with distance from the source. 3. Channel gradient will decrease with distance downstream.
    • Methodology Areas PRIMAY DATA  Cross Sectional Area (width and average depth)  Channel Velocity  Discharge (CSA x Velocity)  Wetted perimeter of channel (channel efficiency)  Hydraulic radius  Channel gradient  Channel bed roughness
    • Methodology Areas SECONDARY DATA What types of secondary data may be useful in your investigation? What might they tell you about the river?  Climate of the area?  Human management of the river?  Vegetation & Geology of the area?
    • Risk Assessment  You must complete your own risk assessment for the fieldwork.  Should include environmental, human and equipment hazards and risks  Needs to be a clear link to your methodologies
    • Ranging poles placed at the wetted edge of the current river channel. Tape measure held taut at 90° to the river channel attached to ranging poles to measure channel width Depth measured at 11 evenly distributed points across the wetted river channel starting from the left bank Large irregular rocks associated with the upper course throughout the channel. Channel edge during the wet season Measurements taken from left to right as you look down stream Tape held about 20cm above water level so a metre rule could be used to measure depth evenly across the channel. Annotated Photograph
    • CROSS SECTIONAL AREA Description & Explanation of Method Justification Risk Assessment Channel width and depth will be measured at each site using the equipment This method will give an Linked to Risk 1a, and method as outlined below. approximation of how b, 2b, 3d channel size changes downstream and will show variations in depth across the channel. By calculating the cross sectional area of the river, along with the wetted perimeter, we are also able to determine the channel efficiency (Hydraulic Action). It will also provide us with By calculating the channel width and average depth we are able to work out the cross sectional area (CSA) of the channel at each site. This is worked out using valuable supporting evidence when compared to river velocity and also discharge. the below formula. CSA = Width x Average Depth
    • Use of GIS Clear use of GIS and well linked to the chosen question  Area of Study & Location Maps – Google Earth  Risk Assessment  Secondary Data collection