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Changes in Flow Volumes and Peak Flows in response to Land Conversions in the Eight Mile Creek Watershed: A Modeling Approach. Navideh Noori Graduate Student, School of Forestry and Wildlife Sciences, Auburn University, nzn0004@auburn.edu Latif Kalin

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slide1

Changes in Flow Volumes and Peak Flows in response to Land Conversions in the Eight Mile Creek Watershed: A Modeling Approach

Navideh Noori

Graduate Student, School of Forestry and Wildlife Sciences, Auburn University, nzn0004@auburn.edu

Latif Kalin

Associate Professor, School of Forestry and Wildlife Sciences, Auburn University, kalinla@auburn.edu

Charlene Lebleu

Associate Professor, Landscape Architecture, Auburn University, leblecm@auburn.edu

PuneetSrivastava

Associate Professor, Biosystems Engineering, Auburn University, srivapu@auburn.edu

background and objective
Background and Objective

Waves break over the shoreline of Lake Pontchartrain, Louisiana

Hurricane Isaac

Urban Hydrograph

Tropical Storm Debby, Florida 2012

New Orleans Flooding

2005 Hurricane Katrina

Sea water surges, Waveland, Miss

2012 Hurricane Isaac

Rainfall/ Discharge

Pre-urban Hydrograph

Time

Changes in Flow Volumes and Peak Flows in response to Land Conversions in the Eight Mile Creek Watershed

Flood issue in coastal areas

Land use and cover changes and urbanization

Minimizing the adverse impacts of urbanization on flooding

Effects of changing land use over time on flow volumes and peak flows

The association of historic (1966) and current (2011) land use/cover conditions with streamflow

study area
Study Area

Changes in Flow Volumes and Peak Flows in response to Land Conversions in the Eight Mile Creek Watershed

flow hydrograph

NLCD 2001, DEM,

Soil Data

HEC-GeoHMS

CN

Flow Hydrograph

Hourly Rainfall

data of Mobile

Regional Airport

station from NCDC

HEC-HMS

Flow Hydrograph

Add Your Text

Changes in Flow Volumes and Peak Flows in response to Land Conversions in the Eight Mile Creek Watershed

slide5

Flow Hydrographs

4 years of streamflow data (1996 to 2000), 12 significant events

March, 2000

January, 1997

March, 1998

March, 1997

Changes in Flow Volumes and Peak Flows in response to Land Conversions in the Eight Mile Creek Watershed

aerial photo 1966

Aerial Photo, 2011

Aerial Photo, 1966

Changes in Flow Volumes and Peak Flows in response to Land Conversions in the Eight Mile Creek Watershed

land use map 1966

Land Use Map (2011)

Land Use Map (1966)

Changes in Flow Volumes and Peak Flows in response to Land Conversions in the Eight Mile Creek Watershed

land use changes over time
Land Use Changes Over Time

Changes in Flow Volumes and Peak Flows in response to Land Conversions in the Eight Mile Creek Watershed

slide9

Design Storms

IDF curves: http://bama.ua.edu/~rain/

Changes in Flow Volumes and Peak Flows in response to Land Conversions in the Eight Mile Creek Watershed

slide10

Results

Changes in Flow Volumes and Peak Flows in response to Land Conversions in the Eight Mile Creek Watershed

index method
Index Method

1

Flood Prone Area

2

3

5

4

Changes in Flow Volumes and Peak Flows in response to Land Conversions in the Eight Mile Creek Watershed

index method1
Index Method

* PFGA: Potential Flood Generating Area

Changes in Flow Volumes and Peak Flows in response to Land Conversions in the Eight Mile Creek Watershed

slide13

Index Method

LULC 2011

LULC 2011 except “1”

LULC 1966

1

1

1

2

2

2

3

3

3

:Area of element j

: Peak flow

R index: A measure of strength of the impact of development of element j on the peak flow due to current LULC per unit area.

R’index: A measure of strength of the impacts of LULC changes on peak flow without considering the area impact.

Changes in Flow Volumes and Peak Flows in response to Land Conversions in the Eight Mile Creek Watershed

slide14

Results

Changes in Flow Volumes and Peak Flows in response to Land Conversions in the Eight Mile Creek Watershed

slide15

Results

Changes in Flow Volumes and Peak Flows in response to Land Conversions in the Eight Mile Creek Watershed

conclusion
Conclusion

Return period (Tr) ↑ peak flow ↑

Relative impacts of land use change diminish with ↑ Tr , except for A-1.

Land use change in A-2 had the biggest contribution to the increased peak flow:

R′1yr=34.1% R′10yr=25.2% R′25yr=21.8% R′100yr=16.7%

A-1, the most upstream area, had the lowest impact on peak flow.

The travel time from A-1 and the non-uniform rainfall distribution cause complex interactions with other areas.

Contribution of urbanization in a watershed to peak flow at a downstream point highly depends on its location (in addition to other factors).

Changes in Flow Volumes and Peak Flows in response to Land Conversions in the Eight Mile Creek Watershed

slide17

Thank You !

Changes in Flow Volumes and Peak Flows in response to Land Conversions in the Eight Mile Creek Watershed