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SPEAKER: | |
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TITLE: |
"Spatially Restricted Surveys Over Time for Aquatic Resources" |
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DAY: |
Monday, May 25, 1998 |
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TIME: |
*** 10:30 a.m. *** |
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PLACE: |
*** BSB-101 *** |
Consideration of the natural characteristics of aquatic resources, and available frame material, has led to the development of new designs for surveying large-scale regions. The purpose of this paper is to illustrate survey designs developed to meet the requirements for surveying coastal waters and estuaries, non-tidal streams and rivers, and lakes. These situations include designs for a finite (discrete) population, such as lakes within one or more states; for a continuous (linear) population within a bounded area, such as wadeable streams within one or more states; and for a continuous (2 dimensional) population within a bounded area, such as coastal waters associated with one or more states. We present a unified approach that addresses the differences of the aquatic resources assuming the availability of frame material, such as GIS coverages of the boundary for coastal waters, stream network and lake locations from USEPA's River Reach File 3, derived from USGS digital line graph data from 1:100,000 scale maps. Key features for the approach are (1) utilizing survey theory for continuous populations within a bounded area, (2) explicit control of the spatial dispersion of the sample, (3) variable spatial density, (4) nested sub-sampling, and (5) incorporating panel structures for sampling over time. The talk is based on joint work with Donald L. Stevens.