Secondary Hydrogeologic Regions of the Conterminous United States
نویسندگان
چکیده
منابع مشابه
Heavy-fog Regions in the Conterminous United States
The heavy-fog statistics for 256 first-order weather stations were utilized to update analyses of the geographic distribution of f o g within the conterminous United States. The survey shows that heavy fog (visibility one-fourth mile or less) occurs more than 20 days a year at approximately 50 percent of the first-order weather stations (of which 229 are air terminals) and that the mean heavy-f...
متن کاملRoadless space of the conterminous United States.
Roads encroaching into undeveloped areas generally degrade ecological and watershed conditions and simultaneously provide access to natural resources, land parcels for development, and recreation. A metric of roadless space is needed for monitoring the balance between these ecological costs and societal benefits. We introduce a metric, roadless volume (RV), which is derived from the calculated ...
متن کاملcentury drought in the conterminous United States
Droughts can be characterized by their severity, frequency and duration, and areal extent. Depth-area-duration analysis, widely used to characterize precipitation extremes, provides a basis for evaluation of drought severity when storm depth is replaced by an appropriate measure of drought severity. We used gridded precipitation and temperature data to force a physically-based macroscale hydrol...
متن کاملEvapotranspiration Intensifies over the Conterminous United States
Using long-term (1948–1996) pan evaporation measurements, a 6% increase in warm-season (May–October) actual evapotranspiration (ET ) is computed over the conterminous United States between 1949 and 1996 via the complementary hypothesis. This predicted increase in ET is in agreement with the measured precipitation increase for the same period if long-term wet-surface ET is assumed to be constant...
متن کاملPROFILE Developing a Spatial Framework of Common Ecological Regions for the Conterminous United States
JAMES E. KEYS US Forest Service Washington, DC 20250, USA ABSTRACT / In 1996, nine federal agencies with mandates to inventory and manage the nation’s land, water, and biological resources signed a memorandum of understanding entitled “Developing a Spatial Framework of Ecological Units of The United States.” This spatial framework is the basis for interagency coordination and collaboration in t...
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ژورنال
عنوان ژورنال: Groundwater
سال: 2018
ISSN: 0017-467X,1745-6584
DOI: 10.1111/gwat.12806