The Main Hydrological Characteristics And Processes Which Operate In Rivers And Drainage
Overview
Every drop of rain that falls on a hillside has somewhere to go. Some soaks into the soil, some trickles slowly underground, and some races over the surface into a stream. Trace these journeys and you have the story of a drainage basin: a single river system fed by every slope that drains towards it. Understand the basin and you understand why rivers flood, why they carve valleys, and why the water you drink is never far from the sky it fell from.
This lesson builds the vocabulary and the mechanics you need for the whole rivers theme. You will learn the parts of a river and its basin, how discharge, velocity and the channel are linked, how water moves through the basin as part of the water cycle, and exactly how a river erodes, transports and deposits its load.
Objectives
- Characteristics of rivers and drainage basins: the long profile, width, depth, speed of flow/velocity, discharge, wetted perimeter, channel, watershed, tributary, confluence, source, mouth.
- The Bradshaw model.
- How the drainage basin operates within the water cycle.
- Processes which operate in a drainage basin: precipitation, interception, infiltration, percolation, overland flow, channel flow, throughflow, groundwater flow, transpiration, evaporation, evapotranspiration.
- Processes which operate within a river: • erosion; hydraulic action, abrasion, attrition, solution • transportation; traction, suspension, saltation, solution • deposition.
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Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on The Main Hydrological Characteristics And Processes Which Operate In Rivers And Drainage. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- The high ground separating two drainage basins is called the: A. confluence B. watershed C. source D. mouth Answer: B
- Discharge is measured in: A. metres per second B. cubic metres per second (cumecs) C. square metres D. kilograms Answer: B
- Which process moves the heaviest material by rolling it along the bed? A. suspension B. solution C. traction D. saltation Answer: C
- According to the Bradshaw model, which variable DECREASES downstream? A. discharge B. channel depth C. load particle size D. channel width Answer: C
- The wearing away of the bed by the load scraping against it is: A. hydraulic action B. abrasion C. attrition D. solution Answer: B
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