U S Geological Survey Professional Paper

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The Quaternary And Pliocene Yellowstone Plateau Volcanic Field Of Wyoming Idaho And Montana

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Geological Survey Professional Paper

Author by : Geological Survey (U.S.)
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U S Geological Survey Professional Paper

Author by : Geological Survey
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Description : This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1902 Excerpt: ...RtJ 4-river-stage or spring-outlet altitude; Q.Jk-recharge or discharge (wells); and hmi. k-head at time step m. In the modeling process, an aquifer is discretized into a number of blocks, and a set of algebraic equations similar to equation (3) is used to represent flow into and out of each block. These equations are solved simultaneously, usually using an iterating solution technique to solve the flow equation (equation 2). The large number of calculations requires the use of a computer. GRID AND BOUNDARY CONDITIONS The eastern Snake River Plain was subdivided areally as shown in figure 21. Blocks within the model boundary (active blocks) were assigned values of transmissivity, storage coefficient, and recharge. Blocks outside the model boundary (inactive blocks) were assigned values of zero. The grid was aligned in a southwest to northeast direction to minimize the number of inactive blocks and to align the x-axis in the principal direction of ground-water flow (pl. 4). Point of origin of the model grid (southwest corner) is at lat 4155'10.00," long 11428'55.00." The Transverse Mercator projection system was used with a central meridian of 11330'; the model grid was rotated 3124' counterclockwise from the central meridian. The grid used in the three-dimensional model is parallel to that used in the two-dimensional model, but the grid spacing is slightly greater--4 mi in the three-dimensional model as compared with 3.95 mi in the two-dimensional modei. An even-mile grid facilitated use of Landsatderived land-use data. Horizontal and vertical boundaries of the active part of the model were treated as specified flux and along the Snake River as head-dependent flux. Recharge wells were used to simulate underflow from the tributary drainage basins (...


U S Geological Survey Professional Paper

Author by : Geological Survey (U S )
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Publisher by : Palala Press
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Description : This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work.This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.


U S Geological Survey Professional Paper

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U S Geological Survey Professional Paper

Author by : US Geological Survey Library
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Publisher by : Wentworth Press
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Description : This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work. This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.


U S Geological Survey Professional Paper

Author by : Nicholas C. Matalas
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Professional Paper United States Geological Survey

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U S Geological Survey Circular

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