USGS - science for a changing world

South Florida Information Access (SOFIA)


projects > everglades ET measurement and modeling > work plan


Project Work Plan

Greater Everglades Science Program: Place-Based Studies

Project Work Plan FY 2003

A. GENERAL INFORMATION:

Project Title: Everglades ET measurement and modeling
Project start date: October 1994 Project end date: September 2005
Principal Investigator: Edward R. German
Email address: egerman@usgs.gov
Phone: 407-865-7575 Fax: 407-865-6733
Mail address: 224 West Central Parkway, Suite 1006, Altamonte Springs, FL 32714
Other Investigator(s): Sandra Kinnaman
Email address: Kinnaman@usgs.gov
Phone: 407-865-7575 Fax: 407-865-6733
Mail address: 224 West Central Parkway, Suite 1006, Altamonte Springs, FL 32714

Project Summary: Solution of water problems within the Everglades requires an understanding of the flow systems. Evapotranspiration (ET) is a major component of the Everglades water budget (generally over 40 inches/year) that has not previously been measured. This project will provide the knowledge of ET necessary for use of hydrologic models.

Project Objectives and Strategy: The overall objective is to develop a process-oriented appraisal of evapotranspiration within the Everglades drainage unit, excluding agricultural and brackish environments. Specific objectives include: 1) Field measurement of evapotranspiration at a variety of sites encompassing a regionally representative range of environmental factors.; 2) Integration of evapotranspiration estimates into a process-oriented model; 3) Verification and refinement of model using ET measurements at additional sites.

Potential Impacts and Major Products: Everglades restoration efforts will rely heavily upon development of hydrologic flow models that will be used to help guide restoration and management decisions. Any hydrologic model requires an assessment of the water budget, including the amount of water removed from the system by evapotranspiration (ET). ET is a major part of the water budget in the Everglades, being similar in magnitude to rainfall. The Everglades ET project provides the necessary ET data, and methods of estimating ET throughout the Everglades system, that are required by all flow models.

Other types of data collected as part of the ET project are pertinent to restoration studies. These include 15-min rainfall quantities, wind speed/direction, and water levels, all of which have been useful to other investigators.

Collaborators: None
Clients: Users of these models and data include universities and a wide variety of government entities, including the National Park Service, the U.S. Army Corps of Engineers, the Fish and Wildlife Service, and the South Florida Water Management District.

B1. WORK PLAN (FY03)

Title of Task 1: Reconnaissance

Title of Task 2: Data collection
Task Leaders: Ed German
Phone: 407-865-7575
Fax: 407-865-6733
Task Status (proposed or active): Proposed
Task priority: 1
Task Personnel: Ed German, Sandra Kinnaman, and Ed Simonds.

Task Summary and Objectives: Six sites will be operated to provide continuous ET and related meteorological data, including water level, rainfall, wind speed and direction, and solar radiation intensity. One site will be relocated to provide better area coverage.

Work to be undertaken during the proposal year and a description of the methods and procedures: Data will be telemetered to the Orlando office by cellular telephone. These data will be inspected weekly or more frequently to detect equipment problems. Site visits for maintenance will be done at approximately 6-week intervals. More frequent visits may be required in case of equipment malfunction. The site S1 in Shark Valley slough will be moved to the Big Cypress area to provide data in the western part of the Everglades.

Planned Outreach: None

Task 3: Sampling and laboratory

Title of Task 4: Meetings
Task Leaders:
Edward R. German
Phone: 407-865-7575
Fax: 407-865-6733
Task Status (proposed or active): Proposed
Task priority: 1
Task Personnel: Edward R. German and Sandra Kinnaman

Task Summary and Objectives: Prepare paper describing new findings for presentation at a science conference or workshop. Prepare poster to present at local university career-day and other events.

Work to be undertaken during the proposal year and a description of the methods and procedures: Analysis of ET data will be done to update and verify previously-published conclusions. A technical paper will be prepared and presented at a selected conference or workshop. A poster summarizing the project activities and findings will be prepared and displayed at local university career-day and other events such as Earth Day. Such events are generally held annually in Orange County, the University of Central Florida and University of South Florida.

Planned Outreach: This task will provide an outlet for latest findings related to ET data and models to scientists and managers involved in or interested in the Everglades and Everglade restoration.

Title of Task 5: Data analysis and modeling
Task Leaders: Edward R. German
Phone: 407-865-7575
Fax: 407-865-6733
Task Status (proposed or active): Proposed
Task priority: 1
Task Personnel: Edward R. German and Sandra Kinnaman

Task Summary and Objectives: The 15-minute raw data from the ET sites will be thoroughly inspected and screened for validity. Hourly ET will be calculated using from the energy budget for each site, using the Bowen ratio method. The objective is to provide actual ET data, together with related meteorological data, for each site, and to develop and test models for predicting ET at any location in the natural Everglades system.

Work to be undertaken during the proposal year and a description of the methods and procedures: This task involves 3 major sub-tasks, as follows: 1) The raw data are imported into spreadsheets and inspected using graphic and statistical techniques. Plots of air temperature, water temperature, and the other parameters are inspected for outliers or other indications of sensor malfunction. Bad data are identified and excluded from ET computations. When possible, missing or bad data are estimated from other information or data from other sites. 2) An energy budget is determined from the measurements of net solar radiation, water heat storage, and soil heat flux. The Bowen ratio (ratio of sensible heat to latent heat) is determined from the measurements of air temperature and vapor-pressure gradients, and the latent heat (ET) is then determined from the available energy and the Bowen ratio. 3) Models of ET as a function of water level, solar radiation, and other variables are developed using the Priestley-Taylor formulation. These models will be compared with similar models developed in other areas, to test the validity of the regional model developed in an earlier phase of this project. Refinements of the regional model will be attempted using recent developments in satellite imagery that provide high-resolution definition of vegetation density. Use of this imagery will be done in collaboration with John W. Jones, USGS, who is studying application of satellite imagery for determining vegetative characteristics of the Everglades.

Planned Outreach: Findings to be presented at GEER conferences and other meetings

Title of Task 6: Products: Database maintenance
Task Leaders: Edward R. German
Phone: 407-865-7575
Fax: 407-865-6733
Task Status (proposed or active): Proposed
Task priority: 1
Task Personnel: Edward R. German and Sandra Kinnaman

Task Summary and Objectives: Annual updates of all raw meteorological data and estimated ET will released.

Work to be undertaken during the proposal year and a description of the methods and procedures: The reviewed and edited 15-minute raw data from the ET sites will be written onto CD-ROM in ASCII flat files for distribution and entry to SOFIA. Estimated hourly ET will be included, but will be subject to revision as more data are collected and models developed

Planned Outreach: Copies of these data CD-ROMs will be available to all interested persons, and will be available for distribution at GEER conferences and other meetings.

Title of Task 7: Geer meeting participation
Task Leaders: Edward R. German
Phone: 407-865-7575
Fax: 407-865-6733
Task Status (proposed or active): Proposed
Task priority: 1
Task Personnel: Edward R. German and Sandra Kinnaman
Task Summary and Objectives: Present latest project findings, data, and status at Geer meeting.

Work to be undertaken during the proposal year and a description of the methods and procedures: Latest information will be presented in poster or oral presentation.

Planned Outreach: This task will provide an outlet for latest findings related to ET data and models to scientists and managers involved in or interested in the Everglades and Everglade restoration.


Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
This page is: http://sofia.usgs.gov/projects/workplans03/evapotrans.html
Comments and suggestions? Contact: Heather Henkel - Webmaster
Last updated: 09 April, 2014 @ 12:18 PM (KP)