Citation:

SEMMENS, D. J., D. T. HEGGEM, D. W. EBERT, W. G. KEPNER, A. M. PITCHFORD, S. JARNAGIN, D. B. JENNINGS, J. D. WICKHAM, L. EXUM, AND D. NORTON. LANDSCAPE ASSESSMENT TOOLS FOR WATERSHED CHARACTERIZATION. Presented at BOSC Water Quality Program Review, Cincinnati, OH, January 25, 2006.

Impact/Purpose:

The primary objectives of this research are to:

Develop methodologies so that landscape indicator values generated from different sensors on different dates (but in the same areas) are comparable; differences in metric values result from landscape changes and not differences in the sensors;

Quantify relationships between landscape metrics generated from wall-to-wall spatial data and (1) specific parameters related to water resource conditions in different environmental settings across the US, including but not limited to nutrients, sediment, and benthic communities, and (2) multi-species habitat suitability;

Develop and validate multivariate models based on quantification studies;

Develop GIS/model assessment protocols and tools to characterize risk of nutrient and sediment TMDL exceedence;

Complete an initial draft (potentially web based) of a national landscape condition assessment.

This research directly supports long-term goals established in ORDs multiyear plans related to GPRA Goal 2 (Water) and GPRA Goal 4 (Healthy Communities and Ecosystems), although funding for this task comes from Goal 4. Relative to the GRPA Goal 2 multiyear plan, this research is intended to "provide tools to assess and diagnose impairment in aquatic systems and the sources of associated stressors." Relative to the Goal 4 Multiyear Plan this research is intended to (1) provide states and tribes with an ability to assess the condition of waterbodies in a scientifically defensible and representative way, while allowing for aggregation and assessment of trends at multiple scales, (2) assist Federal, State and Local managers in diagnosing the probable cause and forecasting future conditions in a scientifically defensible manner to protect and restore ecosystems, and (3) provide Federal, State and Local managers with a scientifically defensible way to assess current and future ecological conditions, and probable causes of impairments, and a way to evaluate alternative future management scenarios.

Description:

Several steps in identifying and restoring impaired waters (the 303d listing/TMDL development process) can involve landscape-scale analysis to maximize effectiveness while minimizing cost. Research and development in support of the TMDL process have addressed these steps in a number of different ways to provide practical tools and methodologies that exploit a range of standardized, national geospatial datasets.

Record Details: