排序方式： 共有3条查询结果，搜索用时 0 毫秒
1
1.
University faculty partners from the Departments of Geography and Instruction and Teacher Education at a large, public university collaborated with K-12 teachers and the leadership of a rural school district in order to investigate the crosscutting content of science, mathematics, and geography through the integration of web-based GIS technologies. The project explored the critical connections among technology, pedagogy, and content with a particular emphasis on developing technology-enhanced, inquiry-based lessons in which the teachers and their students used GIS technologies to analyze, visualize, and present data in real-world contexts. The findings highlight the importance of well-structured professional development that builds community, integrates diverse content and pedagogical expertise, provides feedback and coaching, and is of sufficient duration to effect change. 相似文献
2.
C. A. Robinson A. Werwer F. El-Baz M. El-Shazly T. Fritch T. Kusky 《Hydrogeology Journal》2007,15(1):33-45
Synthetic Aperture Radar (SAR) images, and topographic and groundwater data are used to understand heterogeneities of the Nubian Aquifer between 20–24.5°N and 25–32°E in southwest Egypt. New fluvial and structural interpretations emphasize that the desert landscape was produced by fluvial action, including newly mapped alluvial fans. In central locations, braided channels are spatially aligned with a NE structural trend, suggesting preferential water flow paths that are consistent with the local direction of groundwater flow. The alluvial fans and structurally enclosed channels coincide with gentle slopes and optimal recharge conditions (1–5%) derived from the new Shuttle Radar Topographic Mission (SRTM) slope map, indicating that these areas have high groundwater potential. The SAR interpretations are correlated with anomalies observed in groundwater data from 383 wells. Results suggest a relationship between the spatial organization of fluvial and structural features and the occurrence of low-salinity groundwater. Low-salinity water exists adjacent to the alluvial fans and in SW reaches of the structurally enclosed channels. Wells in the vicinity of structures contain low-salinity water, emphasizing that knowledge of structural features is essential to understand groundwater flow paths. The new approach is cost effective and noninvasive and can be applied throughout the eastern Sahara to assist in resource management decisions and support the much needed agricultural expansion. 相似文献
3.
T. G. Fritch C. L. McKnight J. C. Yelderman Jr. S. I. Dworkin J. G. Arnold 《Environmental Geology》2000,39(9):1063-1069
The Paluxy aquifer in north-central Texas is composed primarily of Lower Cretaceous clastics. This aquifer provides water
for both domestic and agricultural purposes in the region. The study area for this investigation incorporates the outcrop
and recharge areas, as well as the confined and unconfined portions of the aquifer. The purpose of this investigation is to
develop a predictive modeling approach for evaluating the susceptibility of groundwater in the Paluxy aquifer to contamination,
and then compare this susceptibility evaluation to water-chemistry data collected from wells completed within the aquifer.
Using such an approach allows one to investigate the potential for groundwater contamination on a regional, rather than site-specific
scale. Based on data from variables such as land use/land cover, soil permeability, depth to water, aquifer hydraulic conductivity
and topography, subjective numerical weightings have been assigned according to each variables' relative importance in groundwater
pollution susceptibility. The weights for each variable comprise a Geographic Information System (GIS) map layer. These map
layers are combined to formulate the final pollution susceptibility map. Using this method of investigation, the pollution
susceptibility map classifies 32% of the study area as having low pollution susceptibility, 41% as having moderate pollution
susceptibility, 25% as having high pollution susceptibility, and 2% as having very high pollution susceptibility. When comparing
these modeling results with water-chemistry data from wells within the Paluxy aquifer, the four wells with the highest concentration
of nitrate contamination are all found within regions of very high pollution potential. This confirms the accuracy and usefulness
of the predictive modeling approach for assessing aquifer pollution susceptibility.
Received: 1 June 1999 · Accepted: 30 August 1999 相似文献
1