Images

Photograph of tethered boat being deployed from a manned cableway.

Sontek 2

Planview photograph of the OceanScience Riverboat.

Photograph of OceanScience, Inc. rough water trimaran boat for the StreamPro.

Profilers measure velocities in uniformly-sized cells or bins along the acoustic beams (fig 1). By measuring velocities in a number of bins across a channel or vertically through the water column, these instruments produce horizontal or vertical water velocity profiles, hence the designation "profiler.

The AVM measures the average water velocity along the acoustic path (VP, figure 1); then computes the "line velocity," the velocity component parallel with the average downstream flow line.

USGS hydrologist Tim Cowdery titrates water alkalinity in a mobile sampling van using an electronic field form.

Beach-ridge prairie at Glacial Ridge National Wildlife Refuge

USGS technician Jody Hulne collects a groundwater nutrient sample at Glacial Ridge National Wildlife Refuge.

Lab Instrumentation used for target analyses at the OGRL at the KS WSC. Image is of part of the Instrument Laboratory. 

USGS gage 05293000 YELLOW BANK RIVER NEAR ODESSA, MN with High River Water Level From Flood.

USGS scientists load and check the mission path onto an Ecomapper autonomous underwater vehicle (AUV), while other crew members collect vertical profile information using a multiple-parameter water-quality meter. This technology is part of the

A 4" aluminum I-beam is used allow an ADVM to be raised and lowered on a stainless steel sled.

Temporary mount for installation of a horizontal ADVM under ice.  A large flange serves as a load bearing base plate with 2" pipe and pipe fittings being used to suspend the ADVM below.

Diagram depicting stationing in midsection measurement where velocity measurements are acquired. Each station width is multiplied by the station depth and measured velocity to compute the discharge in each section. Section discharges are tabulated to compute a total discharge for the cross section.

Missouri boat and mount.

A well at a restored prairie on Lake Agassiz beach ridge, Glacial Ridge National Wildlife Refuge

Morning fog over beach ridges at Glacial Ridge National Wildlife Refuge

Prairie Dog, Glacial Ridge National Wildlife Refuge

Photograph taken for a USGS project to collect imagery, topographic, and bathymetric data and sources of water and salts of Zuni Salt Lake in west-central New Mexico, 2019.

Photo of stream in urban environment with green lawn beside it. Photo credit: Alan Cressler USGS