The Hydrologic Budget of Wetlands. Jason Hall Robert Lomax Lisa Thatcher November 4, 2003. Overview. Information on hydrology budgets of wetlands Case study of hydrology in a Carolina bay wetland Jason - watershed hydrology of coastal forested wetland of the southern US
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
November 4, 2003
Schalles et. al. 1988
Shallow 5.4 – ha dystrophic Carolina bay wetland
Schalles et. al. 1998
CASE STUDY AREAS:
BRADFORD FOREST WATERSHED
WHICH ARE DOMINATED NATIVE HARDWOODS
*** THESE THREE WATERSHEDS HAVE THE LONGEST CONTINUOUS RECORDS OF HYDRLOGIC RESEARCH IN THE S.E. UNITED STATES
1. Is actual evapotranspiration (AET) from pine flatwoods close or equal to potential forest evapotranspiration (PET) in the long-term? And, is upland forest AET is far less than PET?
2. In the long-term, what caused the hydrologic differences (streamflow/precipitation ratio) among the wetland and upland watersheds, topographical features or climate?
ACTUAL EVAPOTRANSPIRATION (AET)
USE 20% LESS WATER THAN CONIFERS DUE
DUE TO LOWER CANOPY INTERCEPTION LOSS
LOWER PET IN THE MOUTAINS WITH LOWER AIR
COWEETA WATERSHED HAD THE HIGHEST PRECIPITATION AND P/PET RATIO, WITH A MODERATE AET/PET RATIO. THESE FACTORS ARE RESPONSIBLE FOR A HIGHER WATER YIELD INSTEAD OF STEEP TERRAIN.
R/P RATIO FOR BRADFORD IS LESS THAN HALF THAT OF CARTERET EVEN THOUGH BRADFORD IS ON A HIGHER TOPOGRAPHIC RELIEF WITH BETTER DRAINAGE.
Reed Canary Grass Meadow: Phalaris arundinadea
Bluejoint Grass Meadow: Calamagrostis canadensis
Sedge Meadow: Carex lacustis
Cattail-giant Reed Marsh: Typha latifolia
Change in storage calc. using water level readings and estimates of specific yield and above ground storage
Precipitation meas. using automated tipping rain bucket
Surface flow est. using rainfall-runoff method and stage gages
Groundwater flow calc. from piezo readings and hydraulic conductiv. est. using Darcy’s Law. Horizontal component meas. using flownets
Evapotranspiration (ET) calc. using mass balance approach based on water table hydrographMethods
Remainder of input came from surface runoff from uplands
Very little groundwater flow. Wetland recharged aquifer below
Almost all water that came in lost as ET
Change in storage was variable
Large range of error in estimates
Flow patterns characterizedHydro Budget Results
Nine Springs Creek