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Quantitative Elements of Hydrology

© John F. HermanceJanuary 24, 2007

A GIS View of HydrologyA GIS View of Hydrology

Contact information:Jack HermanceEnvironmental Geophysics/HydrologyDepartment of Geological SciencesBrown University, Providence, RI 02912-1846Tel: 401-863-3830e-mail: [email protected]

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Some examples of GIS imagesrelated to hydrology.

Some examples of GIS imagesrelated to hydrology.


Shapefiles of provinces and states; North American Atlas.

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Shapefiles of hydrographics; NA GTOPO30 Hydro1k.

Polylines and polygons of hydrographics; NA GTOPO30 Hydro1k.


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Polylines and polygons (filled) of hydrographics; NA GTOPO30 Hydro1k.


Political bdys and hydrographics.


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Landcover of North America.


Landcover, hydrography and political boundaries.


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Digital Elevation Model (DEM): GTOPO30 Hydro1k.


(30 sec or 1 km gridded data.)

Digital Elevation Model (DEM): GTOPO30 Hydro1k.


(30 sec or 1 km gridded data.)

Elevation is usually represented by gridded values.

(An area of Central Colorado at 1:130,000 scale.)

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DEM (Hydro1k) and hydrography.


DEM (Hydro1k), hydrography and political bdys.


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NA landcover and hydrography.


Populated areas.


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Populated areas and hydrography.


DEM, populated areas and hydrography.


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Hurricane hazards ($/person) and hydrography.


Weather stations and annual precipitation.


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Names, locations and time series of mean monthly precipitationare associated with each station (in this database).



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Example of an ArcGIS graph plot.


Topic: Example of a well-documented catchment.


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State bdy and landcover of Texas.


The Guadalupe Basin, Texas.


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(Sub-Catchments ofGuadalupe Basin.)

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(Sub-Catchments ofGuadalupe Basin.)



[Sub-Catchments might becombined into

Principal Catchments;(i.e. "Dissolve" boundaries)]

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(Info avail. in an Attributes Table.)

Each sub-catchment has selected parameters defined inthe attributes table for the respective data base.



(Other data bases of interest.)

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(Modifying formats.)




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(Label: County names.)



(Label: County names.)


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(Label: % irrigated.)




(Compare data bases;see related map.)

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(Compare data bases;see related map.)

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(View direction.)


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(3D DEM using "Surfer" application.)



(3D DEM using "Surfer" application.)

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(3D DEM overlaid with Landsat data.)

© 2005 William Bowen; Nevada Atlas of Panoramic Aerial Images




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Satellite Vegetation Indices (AVHRR-NDVI).(Upper Quartile (Q75) valuess for all years 95-01. )

• NDVI• Major Roads• Major streams• Topo




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(Note this area.)


(Photograph from Commercial Airbus.)

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(Orthoquad Photo from NV GIS.)


(Landsat image.)

An area of particular interest.

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(Another "point-of-view".)

(© 2005 William Bowen; Nevada Atlas of Panoramic Aerial Images.)


(View-direction for a following image.)

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(View-direction for a following image.)


NASA Space Shuttle Astronaut Photo.

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(Watch this spot.)

An area of particular interest.



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Orthoquad Air Photo.(Configured to perspective viewfrom SSE to WNW by author.)

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Orthoquad Air Photo.



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Note possible drainage patterns,ground moisture, seepage, etc.,

among obvious land use patterns.


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There is often a need to determine the elevation, slope, aspect and/or curvature at an arbitrary point in a grid.

Discuss advantages of 9-point operators.

Terrain Analysis

Derived elevation products.

Basin and Range topography.

Slope aspect.

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Basin and Range topography.

Areas of minimum slope.


Basin and Rangetopography.

Magnitude of local slope.(Aid for detailed delineation.)

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End of Presentation(A GIS View of Hydrology)

End of Presentation(A GIS View of Hydrology)

Contact information:Jack HermanceEnvironmental Geophysics/HydrologyDepartment of Geological SciencesBrown University, Providence, RI 02912-1846Tel: 401-863-3830e-mail: [email protected]

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