GPS helps locate soil erosion pathways.Byline: ANI Washington, August 14 (ANI): With the help of GPS measurements, scientists have located soil erosion pathways and thereby identify placement of grassed waterways to reduce soil erosion. Grassed waterways are placed in agricultural fields where runoff Runoff The procedure of printing the end-of-day prices for every stock on an exchange onto ticker tape. Notes: If the "tape is late" then it can take a long time to print off all the closing prices. water tends to concentrate because they can substantially reduce soil erosion. Mapping techniques that help identify where erosion channels will likely form could help farmers and conservation professionals do a better job of designing and locating grassed waterways in agricultural fields. Tom Mueller, associate professor in the University of Kentucky The University of Kentucky, also referred to as UK, is a public, co-educational university located in Lexington, Kentucky. (UK), College of Agriculture, guided Adam Pike, UK graduate student, on a project that examined whether reliable prediction models This article outlines the various propagation models currently used by the wireless industry for signal transmission at both 900 MHz and 1800 MHz. We start with the foundation of free-space transmission, followed by Picquenard’s multiple knife edge diffraction model. could be created to identify eroded waterways from digital terrain information such as landscape curvature and estimates of water flow from upslope areas. "The terrain attributes were calculated from elevation data obtained with survey-grade GPS measurements collected on a farm in the Outer Bluegrass Region Bluegrass region Area of central Kentucky, U.S. The region contains Kentucky's best agricultural land and thus became the first area to be settled. It became known for its abundant bluegrass and became famous for breeding fine horses; the calcium-rich soil imparts its of Kentucky," Mueller explained. The researchers developed equations that accurately identified the potential locations of erosion-prone areas. They found that simple regression Noun 1. simple regression - the relation between selected values of x and observed values of y (from which the most probable value of y can be predicted for any value of x) regression toward the mean, statistical regression, regression methods could be used to fit these equations as well as more complex non-linear neural-network procedures. The equations were used to map areas in fields where erosion was predicted. These areas corresponded very well with actual field observations of erosion. This work was confirmed with a leave-one-field-out validation procedure. Research showed these maps could help conservation planners and farmers identify where erosion from concentrated flow is likely to occur, but not necessarily the exact shapes of these features. Field site-assessments would still likely be required for verification and to accurately delineate the boundaries of erosion-prone areas. According to according to prep. 1. As stated or indicated by; on the authority of: according to historians. 2. In keeping with: according to instructions. 3. Mueller, "While this study is promising, more work is needed to determine whether these techniques can also be used with USGS USGS United States Geological Survey (US Department of the Interior) digital elevation grids and from elevation data obtained with light detecting and ranging (LIDAR) data." "Further, we need to evaluate whether models can be developed to predict across larger geographic areas," he said. Mueller is conducting follow-up research to evaluate quality of erosion predictions created with 10-m USGS data sets and evaluating the performance of these models on fields in western Kentucky. (ANI) Copyright 2009 Asian News International The Asian News International (ANI) agency provides multimedia news to China and 50 bureaus in India. It covers virtually all of South Asia since its foundation and presently claims, on its official website, to be the leading South Asia-wide news agency. (ANI) - All Rights Reserved. Provided by Syndigate.info an Albawaba.com company |
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