Turbulent Velocity Fluctuations in Natural Rivers

Metadata:

• Identification_Information
• Distribution_Information
• Metadata_Reference_Information

Identification_Information:

Citation:

Citation_Information:

Originator: Bhowmik, Nani G., Author;

Originator: Xia, Renjie, Author;

Originator: Illinois State Water Survey, Author;

Originator: Illinois State Water Survey, Author;

Publication_Date: 1994

Title: Turbulent Velocity Fluctuations in Natural Rivers

Geospatial_Data_Presentation_Form: Conference proceedings

Publication_Information:

Publication_Place: Onalaska, Wisc.

Publisher:

National Biological Survey, Environmental Management Technical Center

Other_Citation_Details:

Extent of Item: 6 p. Date as Writen: April 1994 Illustrative Matter: Diagrams Series Title, Subtitle and Numbering as it appears on item: Long Term Resource Monitoring Program Reprint 94-R005 Notes: (Data entered via BMDB Web Input Form, #B647)

Description:

Abstract:

The longitudinal and transverse components of flow velocity, as well as the normal and tangential stresses, must be expected to fluctuate with time and space when flow at a high Reynolds number moves between fixed boundaries. Although these nonperiodic fluctuations are generally secondary in magnitude compared to the mean motion, they have profound effects on properties of the primary mean motion. Scientists from the Illinois State Water Survey are involved in collecting and analyzing detailed velocity data from the Illinois and Mississippi Rivers using 2-D electromagnetic current meters. The goal of the present research is to understand and evaluate the turbulent structure in natural river systems, especially near the channel border areas. The fluctuation characteristics of flow velocity were analyzed systematically. Flow velocities were measured with time at six different lateral locations and at three different vertical elevations. Analysis of the velocity data included the cross-sectional and vertical distributions of longitudinal and transverse velocity components (u, v), the fluctuating velocity components (u', v') and their frequency-distribution curves, turbulent intensities ( x, y), turbulent shear stress (- u'v'), and turbulent kinetic energy. It appears that velocity, velocity fluctuation, turbulent intensity, turbulent shear stress, and turbulent kinetic energy are all relatively high within the main channel. Moreover, all of these flow parameters decrease in the channel border areas. Thus the main channel area above the riverbed appears to be the most active zone in the river. The study shows that the values of x, y, xy, and average KE are high at elevations of 10 to 20 percent above the bed.

Purpose: Reporting results of research.

Supplemental_Information:

This metadata file can be found at: <URL:http://pubsmeta.er.usgs.gov/metadata/m002001014b_138.txt>; (text format) <URL:http://pubsmeta.er.usgs.gov/metadata/m002001014b_138.html>; (HTML format) <URL:http://pubsmeta.er.usgs.gov/metadata//m002001014b_138.sgml>; (SGML format)

Time_Period_of_Content:

Time_Period_Information:

Single_Date/Time:

Calendar_Date: 1994

Currentness_Reference: No information provided

Status:

Progress: Complete

Maintenance_and_Update_Frequency: None planned

Spatial_Domain:

Description_of_Geographic_Extent: Unknown. This information is not normally part of a publication bibliographic record. The coordinates provided below are default coordinates which cover the United States including Alaska and Hawaii. Bounding_Coordinates

Keywords:

Theme:

Theme_Keyword_Thesaurus: Subject Category from NBII Bibliographic Metadata Input Page

Theme_Keyword: Techniques/Technology

Theme:

Theme_Keyword_Thesaurus:

Testbed Controlled Vocabulary from NBII Bibliographic Metadata Input Page

Theme_Keyword: turbulence

Theme_Keyword: velocity

Theme_Keyword: rivers

Theme_Keyword: illinois river

Theme_Keyword: turbulent fluctuations

Theme_Keyword: main channel

Theme_Keyword: channel border areas

Theme:

Theme_Keyword_Thesaurus: None

Theme_Keyword: turbulence

Place:

Place_Keyword_Thesaurus: None

Place_Keyword: illinois river

Access_Constraints: None

Use_Constraints: None

Point_of_Contact:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Bhowmik, Nani G.

Contact_Position: Author

Contact_Address:

Address_Type: physical and mailing

Address: 2204 Griffith Drive

City: Champaign

State_or_Province: IL

Postal_Code: 61820

Country: USA

Contact_Voice_Telephone: No information provided

Distribution_Information:

Distributor:

Contact_Information:

Contact_Person_Primary:

Contact_Person: Georginia R. Ardinger

Contact_Organization:

National Biological Survey, Environmental Management Technical Center

Contact_Address:

Address_Type: mailing and physical address

Address: 575 Lester Avenue

City: Onalaska

State_or_Province: WI

Postal_Code: 54650

Country: USA

Contact_Voice_Telephone: 608-783-7550

Contact_Facsimile_Telephone: 608-783-8058

Resource_Description: R00138

Distribution_Liability:

Although this data and information has been processed successfully on a computer system at the USGS Biological Resources Division, no warranty expressed or implied is made regarding the accuracy or utility of the data and information on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. This disclaimer applies both to individual use of the data and information, and aggregate use with other data and information. It is also strongly recommended that careful attention be paid to the contents of the metadata file associated with these data and information. The USGS shall not be held liable for improper or incorrect use of the data and information described and/or contained herein.

Standard_Order_Process:

Fees: $17.50.

Ordering_Instructions:

Release unlimited. Available from National Technical Information Service, 5285 Port Royal Road, Springfield, VA 22161 (1-800-553-6847 or 703-487-4650). NTIS Accession No. PB 94-178142.

Metadata_Reference_Information:

Metadata_Date: 19990608

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Illinois State Water Survey

Contact_Address:

Address_Type: mailing and physical address

Address: 2204 Griffith Drive

City: Champaign

State_or_Province: IL

Postal_Code: 61820

Country: USA

Contact_Voice_Telephone: No information provided

Metadata_Standard_Name: NBII

Metadata_Standard_Version: FGDC-STD-001-1998