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USING HYDROLOGY TO COMPARE A REGIONAL HYDROGEOMORPHIC (HGM) CLASSIFICATION ACROSS A LATITUDINAL GRADIENT OF THE APPALACHIAN MOUNTAINS Charles Andrew Cole.

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Presentation on theme: "USING HYDROLOGY TO COMPARE A REGIONAL HYDROGEOMORPHIC (HGM) CLASSIFICATION ACROSS A LATITUDINAL GRADIENT OF THE APPALACHIAN MOUNTAINS Charles Andrew Cole."— Presentation transcript:

1 USING HYDROLOGY TO COMPARE A REGIONAL HYDROGEOMORPHIC (HGM) CLASSIFICATION ACROSS A LATITUDINAL GRADIENT OF THE APPALACHIAN MOUNTAINS Charles Andrew Cole - Penn State University Chris Cirmo - SUNY, Cortland Denise Wardrop - Penn State University Robert P. Brooks - Penn State University Jessica Peterson – Penn State University

2 Riparian Depressions NY PA VA

3 1997 HGM key for the Ridge and Valley A quick means of identifying HGM subclass A direct way into the assessment of function May or may not work anywhere else along the Appalachian Mountains Objective: Use hydrology to assess HGM key north and south along Appalachian Mountains

4 Hydrogeomorphology Depression Slope Floodplain Fringing Flats Impoundment

5 Reference Wetlands Group of natural wetlands w/in a region Pristine to disturbed Used to develop range of expected conditions Problems include: Lack of good data Hard to get good data Need landscape component Relationship between functions and values?

6 Riparian Depression Adjacent to streams Surface outlet with unidirectional flow No water from overbank flooding Soils saturated, rarely flooded Low energy systems PEM, PSS, PFO

7 Slope On topographic gradient Surface and groundwater Saturated, rarely inundated Low energy systems PEM, PSS, PFO

8 Headwater floodplain Adjacent to 1st, 2nd order streams Not much overbank flooding. Overland flow, groundwater Saturation. Often dry Low to high energy Frequently PFO, PSS

9 Hydrology RDS WL40s and Ecotones

10 Headwater floodplains Slopes Riparian depressions 1=PA 2=NY – AD 3=NY – Cat 4=VA

11 Median depth (cm) – headwater floodplain PANY-ANY-CVA (Kruskal Wallis H=5501.1, df=3, p<0.000)

12 Median depth (cm) – slope PANY-ANY-CVA (Kruskal Wallis H= , df = 3,P< 0.001)

13 Median depth (cm) – riparian depression PANY-ANY-C VA (Kruskal Wallis H= , df=3, p<0.001)

14 Headwater floodplain Slope Riparian depression

15 Wet and dry periods – by HGM subclass

16 And the reason is….

17

18 Credit: David Westphalen/Painet Inc.

19 New York wetlands were substantially impacted by beaver Hard to find any site that was not modified by a beaver Really altered the duration of wet periods (though not dry periods) Reduced fluctuations

20 We will need to revamp the HGM classification Works well south … other locations depend on beavers?


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