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OSW Hydroacoustics

Prerequisite Material for the SW1319 - Streamflow Record Computation Using ADVMs and Index-Velocity Methods Training Course

Version 1.00 - January 2016


Objective

The use of the index-velocity method has benefitted the USGS streamgaging program by providing a means to obtain more accurate streamflow data in challenging measurement environments. The goal of this online course is to provide students with the basic knowledge needed to attend the SW1319 Streamflow Record Computation Using ADVMs and Index-Velocity Methods training course, including a familiarity of:

The course also is a valuable refresher for students who are already familiar with the index-velocity method.


Taking the Course

The course should take no longer than 7 hours to complete. Students can stop and resume where they left off within each lesson as needed.

Prerequisites

Narration and Slide Notes

Assessment and Course Credit

Questions and Problems


Course Lessons

Click on the lesson title below to start each lesson.

Course Overview

Contains an overview of the course, including how to operate the lesson player, information on the instructors, what will be covered, and how to obtain help with the course. This lesson also includes a pre-course assessment to assess what you may already know about the index-velocity method.

Lesson 1 - Introduction to the Index-Velocity Method

By the end of this lesson, the student will be able to:

  1. Describe river conditions that require use of the index-velocity method to compute streamflow
  2. Define the major terms used in the index-velocity method

Lesson 2 - Acoustic Measurement Theory

By the end of this lesson, the student will be able to:

  1. Describe how an acoustic Doppler velocity meter (ADVM) measures water velocity
  2. Describe considerations and limitations of ADVMs for measuring water velocity

Lesson 3 - Reconnaissance Techniques and Site Selection

By the end of this lesson, the student will be able to:

  1. List the characteristics of a "good" site for an index-velocity streamgage
  2. List resources that can be used to perform reconnaissance of potential sites

Lesson 4 - Considerations for ADVM Selection

By the end of this lesson, the student will be able to:

  1. Describe the connection between ADVM frequency and measurement range
  2. Define what types of ADVMs may be appropriate for certain stream conditions
  3. Describe the advantages and disadvantages of measuring multiple cells of velocity

Lesson 5 - ADVM Mounting, Installation, and Maintenance

By the end of this lesson, the student will be able to:

  1. List the characteristics of a "good" mount for an ADVM
  2. Describe various options for mounting ADVMs based on example mounts presented in the lesson
  3. Discuss steps needed to properly maintain ADVMs in the field after they are installed

Lesson 6 - Configuring an ADVM's Measurement Volume

By the end of this lesson, the student will be able to:

  1. Describe the major considerations when configuring the ADVM measurement volume
  2. Describe the different configuration settings for the range-averaged and multi-cell measurement volumes

Lesson 7 - Configuring an ADVM's Other Settings

By the end of this lesson, the student will be able to:

  1. Define measurement interval, averaging period, salinity, and SDI-12
  2. Describe how site considerations affect the programming of the measurement interval and averaging period
  3. Differentiate among various stages of data collection and describe how they influence the programming of the measurement interval and averaging period

Final Assessment

The final assessment must be taken and passed with a score of 80% or better to attend the classroom portion of the SW1319 course. Instructions for submitting the results to instructors are provided at the end of the assessment. Note: If the final assesment is attempted on a mobile device, the installation of a free app may be required.