2 edition of Floods from small drainage basins in Alaska found in the catalog.
Floods from small drainage basins in Alaska
Stanley H. Jones
1983 by U.S. Dept. of the Interior, Geological Survey, Open-File Services Section, Western Distribution Branch in Anchorage, Alaska, Denver, Colo .
Written in English
|Statement||by Stanley H. Jones ; prepared in cooperation with the Alaska Department of Transportation and Public Facilities and U.S. Department of Transportation, Federal Highway Administration.|
|Series||Open-file report (Geological Survey (U.S.)) -- 83-258.|
|Contributions||Alaska. Dept. of Transportation and Public Facilities., United States. Federal Highway Administration., Geological Survey (U.S.)|
|The Physical Object|
|Pagination||1 v. :|
As the coast rebounded, the sea retreated, but it still fills the lower reaches of preglacial valleys. The ascent of warm, moist, unstable air up the slopes of hills and mountains supports and enhances the development of severe thunderstorm cells that can yield substantial rainfall. Light to moderate rain showers are common under these conditions, but occasionally extreme rainfall intensities and subsequent flooding can occur, especially during periods of frontal passage and storm activity in the winter and tropical cyclone activity in the summer and fall. Glaciation is a powerful and rapid tool for reshaping the landscape. XVII, no.
During the Ice Age, or Pleistocene Epoch—extending from approximately 3 million to 10, years ago, massive glaciers, referred to as the Flathead Lobe of the Canadian Cordilleran ice sheet, advanced at least four times from Canada south into the Flathead Valley, extending as far south as St. The point of initial genesis of these cyclones and their season of occurrence are affected principally by the presence of sea-surface temperatures of about 79 degrees Fahrenheit or warmer Gray, This was the setting for the next, and very dramatic, step in the evolution of northwest Montana—glaciation. But instead of the expected marked differences between the glaciated and residual soils, he found a thin, disturbed, and structureless soil spread over the entire landscape, under the current organic layer. I mapped distinct glaciers on the northern tip of the Antarctic Peninsula alone, including outlet glaciers that drain the Antarctic Peninsula Ice Sheet and separate mountain glaciers and ice caps. Although many processes are well understood at a point or for a small area, others are poorly understood at all scales, and process interactions under normal or extreme climatic conditions may be unknown.
In the riparian zone near rivers and streams, erosion control measures can be taken to try to slow down or reverse the natural forces that cause many waterways to meander over long periods of time. Flood waters provide much needed water resources in arid and semi-arid regions where precipitation can be very unevenly distributed throughout the year and kills pests in the farming land. The desert is one of the four biologically defined deserts in North America, in addition to the Mojave, Sonoran, and Chihuahuan Deserts. Geological Survey, National water summary Hydrologic events, selected water-quality trends, and ground-water resources: U. For the dry Southwestern U.
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Muller, R. When a dam is constructed in a valley, it floods the area upstream, putting homes, farmland, and even whole villages underwater. Douglas, A. The Mississippi River swelled to over 7 miles 11 kilometers wide in some places.
As the banks overflow, water rushes forward at speeds of up to 20 mph 35 kph. Figure Glaciers are shown in black. If you are in a car during a storm, watch for flooding where the road dips down, under bridges, and in low areas. In southern China, just north of the border with Nepal, one unnamed Himalayan glacier flows from southwest to northeast, creeping down a valley to terminate in a glacial lake.
Extreme precipitation intensities of as much as 1. Levees failed in more than places on the Mississippi and its tributaries. On the shelves: The Epic of Gilgamesh The Epic of Gilgamesh is a four-thousand-year-old story about a king from the region that is now Iraq. Pathways data from Bryson and Hare, ; precipitable water vapor data from Reitan, Regionally, the dominant air masses and moisture-delivery pathways shift as the seasons progress.
A storm surge is a several-foot-high wall of water that results in the flooding of 40 to miles 65 to kilometers of coastline. Data from Reitan, The greatest influx of precipitable water vapor across the entire conterminous United States occurs in July fig.
These make up lateral and end moraines. To attribute the flood damage to the "inferiority" of the vegetation carries the implication that stable mature vegetation would have prevented it.
The Messinian Salinity Crisis MSCalso referred to as the Messinian Event, and in its latest stage as the Lago Mare event, was a geological event during which the Mediterranean Sea went into a cycle of partly or nearly complete desiccation throughout the latter part of the Messinian age of the Miocene epoch, from 5.
Rainfall intensity is the second most important factor for watersheds of less than approximately 30 square miles or 80 square kilometres. Augustine, J. This sinuous movement of air in the upper atmosphere forms troughs of low pressure and ridges of high pressure that normally progress eastward from day to day.
Extensively urbanized areas flood easily because of the decreased infiltration capacity of the land surface resulting from buildings, paved streets and parking lots, and sidewalks.
In areas prone to urban flooding, one solution is the repair and expansion of man-made sewer systems and stormwater infrastructure. He reported: "Soil analyses of carbon, nitrogen, moisture equivalent, carbonates, acidity, and cation exchange relations show how most soil improvement of the original barren dune sand occurs within about a thousand years after stabilization.
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Detrital sediment is carried from land to the sea by three agents, rivers, glaciers, and winds. The shoreline is an arbitrary boundary within the detrital sediment transport system, which extends from a site of origin across areas of temporary storage to a site of long-term atlasbowling.com by: Elevation Data for Small Drainage Basins within the Des Moines Lobe Landform Region in Iowa Kansas FSC Rural Regression Equations Kansas Dept of Transportation Louisiana LMG WSC Hydrologic Data Programs Louisiana Dept of Transportation and Development ‐ Intelligent Transportation Systems.
Some people divide these three ice sheets up further into 24 large drainage basins. These drainage basins can be further subdivided into outlet glaciers that drain the ice sheet.
There are also many glaciers around the periphery of the three main ice sheets. Wikipedia lists over of named glaciers. Many thousands more, both large and small.
- floods help flush out stream channels and remove debris, such as boulders, logs & tree branches that may have accumulated - floods sweep nutrients & other food supplies downstream, potentially increasing the survival of aquatic organisms.
Using Hydrologic Data to Forecast Floods - USGS - by By Charles W. Boning and Eugene A. Stallings, Flood of - Mississippi/Missouri River. Flood Uncovers Devonian Sea Floor - ancient fossil beds - University of Iowa - many photos; ASF - Alaska SAR Facility - Synthetic Aperture Radar analysis of the floods.