EPA Science Inventory

Growth of Cities and Loss of Streams: Land Cover Change Impacts on Stream Channel Loss in Central Oklahoma from 1874 to 2010

Citation:

Wilgruber, N., J. Julian, K. de Beurs, AND P. Mayer. Growth of Cities and Loss of Streams: Land Cover Change Impacts on Stream Channel Loss in Central Oklahoma from 1874 to 2010. Presented at Joint Aquatic Sciences Meeting, Portland, OR, May 18 - 23, 2014.

Description:

Central Oklahoma has undergone substantial land cover changes since the 1800’s. Accordingly, regional watersheds have been covered by impervious surfaces, peripheral agricultural areas have been subdivided or intensified, and large reservoirs have been constructed. Here, we present how land cover changes have impacted the stream channel network of the 666 km2 Lake Thunderbird watershed, which drains parts of four major cities in central Oklahoma. Our timeline begins in 1874 when the watershed was dominated by forest and mixed prairie, and ends in 2010 when the watershed was covered by 17% Urban, 43% Agriculture, and 5% Water, with virtually all water attributed to impounded reservoirs or farm ponds. Over this period, these land cover changes have resulted in hundreds of kilometers of lost stream channels in the watershed and decreased drainage density by 25%. Land cover change to Urban led to channels lost in short, fragmented segments. Agriculture resulted in losses of typically longer segments, while reservoirs replaced segments several km long. This widespread channels loss from landscape-scale drivers has implications for stream ecosystems by decreasing watershed connectivity and changing nutrient dynamics.

Purpose/Objective:

Improved methods are needed to efficiently and effectively estimate stream loss and burial due to land use change. The approach used here relies upon available historic survey and aerial data to plot trends over time. Land use change from agriculture, urbanization, and reservoir impoundments produced vastly different patterns and trends in stream loss, a result that has significant implications for managing water resources at a watershed scale and for implementing restoration and green infrastructure efforts.

URLs/Downloads:

ABSTRACT - MAYER.PDF   (PDF,NA pp, 19.47 KB,  about PDF)

Record Details:

Record Type: DOCUMENT (PRESENTATION/POSTER)
Completion Date: 05/27/2014
Record Last Revised: 05/27/2014
Record Created: 05/27/2014
Record Released: 05/27/2014
OMB Category: Other
Record ID: 276911

Organization:

U.S. ENVIRONMENTAL PROTECTION AGENCY

OFFICE OF RESEARCH AND DEVELOPMENT

NATIONAL HEALTH AND ENVIRONMENTAL EFFECTS RESEARCH LAB

WESTERN ECOLOGY DIVISION

ECOLOGICAL EFFECTS BRANCH