helen dahlke, daniel r. fuka, zachary m. easton tammo s. steenhuis
DESCRIPTION
Development of an internet-accessible tool for the identification of hydrologically sensitive areas (HSA’s) and the calculation of New York State phosphorous indices. Helen Dahlke, Daniel R. Fuka, Zachary M. Easton Tammo S. Steenhuis. Introduction. - PowerPoint PPT PresentationTRANSCRIPT
Development of an internet-accessible tool for the identification of hydrologically sensitive areas (HSA’s) and the calculation of New York State
phosphorous indicesHelen Dahlke, Daniel R. Fuka, Zachary M. Easton
Tammo S. Steenhuis
Introduction
• hydrologically sensitive areas (HSA‘s) are preferred flowpath in the landscapes of the humid Northeast of the US
• connect mostly agricultural land to streams and lakes
• need of estimation of the risk of nutrient loads in surface waters: CNMP planner help producer to identify high risk transport areas when applying manure
• current tools use a fixed distance setting from a watercourse and/or soil wetness indicators
• need of tools that consider the landscape position of saturation areas and their spatial-temporal dynamics
• tool must be user-friendly and easy accessible
study areas Salmon Creek: 227 km² (87.7 mi²)
Fall Creek: 326 km² (126 mi²)
Six Mile Creek: 102 km² (39 mi²)
model approach
rainfall ETIf rainfall > ET,
soil wets upIf rainfall > soil storage,
excess overland flow
• flowaccumulation• slope• soil depth• soil hydraulic
conductivity
SPPQe
e
2
DEM
DK
a
s
tanln
Soil topographic wetness index
• Calculation of the fractional area of the watershed prone to saturation
terr
ain
anal
ysis
hydr
olog
y
Google Earth-based HSA-tool
• Google Earth (http://earth.google.com) is free software that provides a virtual globe program
• it maps earth by superimposition of satellite images, aerial phorographs and GIS maps over a 3D globe
• user can program their own data overlays of vector or raster data using the Keyhole Markup Language (KML)
• maps can be animated based on a time stemp ideal for time series application such as simple hydrological models
realization of the HSA-tool in Google Earth
Soil topographic wetness index [Geo-Tiff]
Soil topographic wetness index [GRID]
• reclassification into 255 classes of equal area• export into Geo-Tiff
HSAimage [png]
modelled fractional area of HSA‘s [table]
• conversion to web-image
*.png file• 1% incremental area
images KML-file for Google Earth
realization of the HSA-tool in Google Earthcontrol bar for timeseries simulation
loaded images of HSA‘s for each day of simulation
Six Mile Creek
realization of the HSA-tool in Google Earth
daily estimated level of phosphorous load is displayd at the outlet of the catchment
http://vsa-hydro.cornell.drfuka.org/townbrook/1998.kml
http://vsa-hydro.cornell.drfuka.org/sixmile/1998-05.kml
http://128.253.239.23/Website/Imagetest/viewer.htm