RiverSurveyor Expanded Description

1. Introduction

The RiverSurveyor system uses a SonTek/YSI ADP (Acoustic Doppler Profiler) as the primary hardware component. The ADP is a high-performance current profiler that is accurate, reliable, and easy to use (Figure 1). The ADP measures 3D velocity in a user-specified number of depth cells over a range of up to 110 m (Figure 2). The first current profiler designed specifically for shallow water applications, the ADP has revolutionized the current profiler market since being introduced in 1994. Our Windows-based RiverSurveyor (Figure 3) real-time program makes it easy to display and analyze data.

RiverSurveyor ADPs use our proven Doppler technology to make the most accurate and robust current measurements possible. With no moving parts, the ADP is highly resistant to biofouling even in the most challenging environments. The ADP is simple to use, affordable, and does not require recalibration or factory maintenance.

The ADP uses state-of-the-art transducers and electronics designed to reduce side lobe interference problems that plague other current profilers. This allows the ADP to make the near-bottom current measurement that is so critical to accurate discharge calculations.

2. RiverSurveyor ADP System Configurations

RiverSurveyor ADPs are available in a variety of models and configurations. The most popular model stands 30.5 cm (12 in.) tall (0.5-MHz models are slightly taller) and features three acoustic transducers. Our extensive experience has shown that three transducers provide excellent performance under most circumstances. As we realize that some customers may be accustomed to four-beam (Janus) arrangements, this is offered as a special option for an additional cost.

ADPs are also available in low-profile housings as shown in Figure 5.

Figure 4. Typical ADP Beam Configurations

Figure 5. Mini-ADP

3. RiverSurveyor ADP Standard Features

The standard features available for RiverSurveyor ADPs are described below.

3.1. Acoustic Frequency

The most important choice when selecting an ADP is acoustic frequency. This determines the range of the ADP and the resolution within the profile. Lower frequencies giver longer ranges, while higher frequencies give shorter range with higher resolution. The RiverSurveyor ADP is available in five standard frequencies -- 0.5, 1.0, 1.5, and 3.0 MHz.

3.2. Programmable Sampling Parameters

All parameters relating to ADP operation can be easily selected by the user. These include depth cell size, number of depth cells, and averaging time for each profile. The ADP also supports a range of flexible sampling strategies for reduced duty cycle operation and burst sampling. The velocity-referencing method (DGPS, bottom-track, or both) is also a simply-set parameter.

3.3. Diagnostic Parameters

All ADPs record extensive diagnostic parameters with each profile. These include signal strength (to determine the effective profile range and estimate suspended sediment concentration) and standard deviation of velocity data (a direct measure of the accuracy of velocity data).

3.4. Temperature Sensor

All ADPs include a temperature sensor to automatically compensate for changes in sound speed. The ADP uses sound speed to convert the measured Doppler shift to water velocity.

3.5. Serial Communication Protocol

All ADPs support RS232 and RS422 serial communication. RS232 is used for operation on cable lengths to 100 m. RS422 is used for cable lengths to 1500 m.

• RiverSurveyor Overview
• RiverSurveyor Applications
• RiverSurveyor Specifications
• RiverSurveyor Principles of Operation
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