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Parameter Sensitivity in Hydrologic Modeling - page 36 / 163

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Chapter 3: Methodology

3.1

INTRODUCTION

Case studies were conducted as a means to compare traditional methods of parameter calculation to automated methods of parameter calculation. Case studies were conducted on each of the four levels of current model development. The first case study uses purely traditional methods on paper maps. The second

level involves using a computer and ArcView boundaries and channels from scanned USGS

GIS 3.2 to quadrangle

digitize the

watershed

maps. The

third level

involves using ArcView GIS 3.2 Modeling System) to compute

(with CRWR-PrePro) and WMS (Watershed hydrologic parameters from two different

resolution DEMs, a 10 meter DEM two different resolution DEMs is to

and a 30 quantify

meter DEM. The purpose of using cell scale effects on channel length,

watershed slope, irregular network

and watershed area. The final method uses a (TIN) and the TIN processing capabilities of WMS.

triangulated

Figure 3.1 illustrates the watershed parameters that are the focus of this investigation. The longest flow path (LFP) is the longest length a drop of water will travel in the watershed. The area of the watershed encompasses all the water that will flow to the watershed outlet, and the slope of the watershed is the difference in a representative watershed elevation divided by a representative watershed length. Chapter 2 outlines several methods used to calculate slope, depending on the application. The soil type and land use are used to derive a

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