Recent changes in land use of Spanish rural areas (agricultural intensification and/or abandonment) have significantly altered the hydrological behaviour of catchment and erosion rates on hillsides. The rainfall simulation represents a very effective tool to estimate soil losses associated with these changes. This paper gives information about sediment ...
NASA Astrophysics Data System (ADS)
Reconfiguration of hillside field into terrace is regarded as one of the key techniques for water and soil conservation in mountainous regions. On slopes exceeding 30 degrees, the traditional techniques of terracing are difficult to apply as risers (i.e., backslopes), and if not reinforced, are so abrupt and easy to collapse under ...
PubMed
The U.S. Bureau of Mines (USBM) report summarizes a field demonstration of pneumatic backfilling technologies conducted at the abandoned Hillside Coal and Iron Slope in Vandling, PA. Researchers demonstrated two pneumatic backfilling technologies recently...
National Technical Information Service (NTIS)
Despite widespread bench-terracing, stream sediment yields from agricultural hillsides in upland West Java remain high. We studied the causes of this lack of effect by combining measurements at different spatial scales using an erosion process model. Event runoff and sediment yield from two 4-ha terraced hillside ...
... sometimes lead to land degradation as terraces, irrigation systems, fire control, and invasive species control are abandoned, and rural ... ...
NBII National Biological Information Infrastructure
This poster illustrates what we believe to be an effective approach in teaching landscape development and environmental change in the field. We present a case study from a second year undergraduate residential field course based in the Wicklow Mountains (Ireland). The overall aim of the field course is to support the 2nd year undergraduate teaching programme and provide the students with practical ...
... submerged terraces, Yellowstone Lake. In Yellowstone Physical Science Symposium, 3rd, Abstract with Programs. Yellowstone National Park, ... abandoned shorelines and sediments. Report 90-3, Y...
meandering pattern, involving the construction of new terrace levels and the stabilization of fluvial bars. Keywords: fluvial adjustments, sediment yield, fluvial incision, farmland abandonment, Central Spanish sediment input to the fluvial system, resulting in widening, straightening and aggradation, whereby
E-print Network
and Price, 1994), Yemen (Vogel, 1987, 1988; Varisco, 1991), Lebanon (Zurayk, 1994), Nepal (Johnson et al of �eld surface. Possible causes of abandonment include demographic, social and biophysical factors or epiphenomenal factors. While terraces may also have served social, political or military functions, most
and accumulation of overbank sediments ca. 8000 yr B.P. (terrace level T1a), 7000� 5600 (T1b), 3100�2600 (T2), 2000 methods to date fluvial deposits and terraces of Soda Butte Creek and the Lamar River and abandoned cutbanks in fan toes expose the entire thickness of distal fan sediments overlying axial-stream fluvial
The Manastash Ridge range front on the south edge of the Kittitas Valley near Ellensburg Washington is a prominent north-facing range front within the Yakima fold belt that hosts a suite of landforms that may reflect active faulting. Quaternary mapping on LiDAR imagery of the northern limb provides evidence for episodic uplift and/or base level lowering that may be associated with crustal ...
10Be and 36Cl cosmic ray exposure (CRE) and optically stimulated luminescence (OSL) dating of offset terraces have been performed to constrain the long-term slip rate of the Dehshir fault. Analysis of cosmogenic 10Be and 36Cl in 73 surface cobbles and 27 near-surface amalgams collected from inset terraces demonstrates the occurrence of a low denudation ...
Resembling a cross between an underground continuous miner and a surface augering machine, the Thin Seam Miner (TSM) is able to bore into coal seams from new or abandoned highwalls to distances of 220 ft. This ability, enhanced by the incorporation of natural-radiation sensors, allows a TSM to recover 80% to 85% of coal left in the hillside after ...
Energy Citations Database
Fluvial strath terraces represent ancient and now abandoned river floodplains that formed during times of lateral channel erosion and valley widening. Both climatically controlled hydraulic conditions and tectonic deformation (e.g. uplift) influence the formation and latter incision of these erosional surfaces, however the specific forcing mechanisms for ...
The northern piedmont of the western Kunlun mountains (Xinjiang, China) is marked at its easternmost extremity, south of the Hotan-Qira oases, by a set of normal faults trending N50E for nearly 70 km. Conspicuous on Landsat and SPOT images, these faults follow the southeastern border of a deep flexural basin and may be related to the subsidence of the Tarim platform loaded by the western Kunlun ...
Agricultural landscapes illustrate the impact of human actions on physical settings, and differential human pressures cause these landscapes to change with time. Our study explored changes in the terraced landscapes of Nisyros Island, Greece, focusing on the socioeconomic aspects during two time periods using field data, cadastral research, local documents, and published ...
This study examines the status of women in relationship to land ownership, the resources they are exposed to and management practices, consequently its effect on the environment of Manjiya County, Mbale District in (now Manafwa since 2008) Uganda. It was found out that low levels of education limit women's abilities of creativity and innovativeness to work on the land sustainably. They lack access ...
ERIC Educational Resources Information Center
Alluvial terraces represent the end product of sedimentary cycles; each includes sediment generation, transport, accumulation, and the ultimate incision that forms abandoned alluvial surfaces. We examine the middle Pleistocene to recent drainage system evolution in Makhtesh Hazera, Negev Desert, southern Israel and compare the characteristics of erosion ...
An estimated 4,764 owners provided information about the elimination of one or more conservation practices during the 1975-77 period. Of these owners 27 percent eliminated terraces, 19 percent eliminated grass waterways, 36 percent removed windbreaks, and...
The development of intensive agriculture in the plains of mainland Greece provides products with lower cost than those obtained from terrace agriculture in the islands. The result is the abandonment of the islands' agriculture followed by collapse of the traditional agropastoral systems of management. When fires and overgrazing follow, desertification ...
N 76 E 84 E KeriyaRiver Tarim River 500 km Figure 2. Topographic and geographic map of Central Asia and ultimately drain into the Tarim Basin (Fig. 3). The Kalanggou- lukehe and the Boguzihe ("he" indicates river the kinematics of fold growth. Where rivers cut through growing anticlines, flights of abandoned fluvial terraces
with lightweight concrete, sealed and painted to complete the model. Mississippi River water was routed through distinct implications for resulting erosion of stored sediments. This appears to be due to the unique river be difficult for the river to further erode abandoned terraces. Erosion that does occur will likely
abandoned, similarly the terraces with olive trees. The state accelerated the migration into cities by an additional source of income in times of the migration into cities. Between 1920 and 1930 farmers started was grown. This Lavandula hybrida (French and German "Lavandin") is a hybridisation between L. angustifolia
Language: English ...
Understanding spatial and temporal patterns of strain release on intracontinental fault systems requires estimates of slip that span multiple intervals of time. The use of fluvial terrace risers as passive markers of displacement is increasingly common, as these landforms offer the potential to determine slip rates over 103 to 105 yr and are found across a wide variety of ...
This US Bureau of Mines (USBM) report summarizes a field demonstration of pneumatic backfilling technologies conducted at the abandoned Hillside Coal and Iron Slope in Vandling, PA. Researchers demonstrated two pneumatic backfilling technologies recently developed under the USBM`s Abandoned Mine Reclamation Research Program, the ...
Millennial slip rates have been determined for the Altyn Tagh fault (ATF) at three sites near Aksay (~94�E) in northeastern Tibet by dating fluvial channels and terrace riser offsets with radiocarbon and 10Be-26Al surface exposure dating. Up to nine main surfaces are defined on the basis of morphology, elevation, and dating. The abandonment age of some ...
Alluvial terraces may be used as markers of the deformation across faults. According to fault-bend folding theory (Suppe, 1983; Fig. 1), the amount of slip recorded since abandonment of a terrace level may be computed in 3 ways by measuring: 1/ terrace heights on the hanging wall relative to the foot wall (h1, h2), ...
Along the Rangitikei river flows (North Island, New Zealand), a widespread climatically-controlled fluvial terrace formed from ~30 ka to the Last Glacial Maximum. At that time, the river had a braided course and was aggrading. Since the LGM, the river has cut into the bedrock and the LGM terrace is presently preserved 75 m above the current level of the ...
To tackle the history of active thrusts, it is necessary to open the observation window on time scales on the order of 10^4-10^5 years by studying the morphology associated to their activities. Because fluvial systems are particularly sensitive to recent environmental changes, geomorphic features such as alluvial terraces are frequently used as markers to gauge deformation. ...
To tackle the history of active thrust or reverse faults, it is often necessary to open the observation window on time scales on the order of 10^4-105 years by studying the morphologies associated to their activities. Because fluvial systems are particularly sensitive to recent environmental changes, geomorphic features such as alluvial terraces are frequently used as markers ...
In many actively incising river canyons, gravel-capped bedrock strath terraces occur 10�s to 100�s of meters above the active channel and extend discontinuously for kilometers, often paralleling the river profile. For a strath terrace to form, lateral planation of bedrock is necessary. Current theory and observation demonstrate that high coarse ...
A method of gasification of coal in deep, thin seams by using controlled bending subsidence to confine gas flow to a region close to the unconsumed coal face is given. The injection point is moved sequentially around the perimeter of a coal removal area from a production well to sweep out the area to cause the controlled bending subsidence. The injection holes are drilled vertically into the coal ...
A method of gasification of coal in deep, thin seams by using controlled bending subsidence to confine gas flow to a region close to the unconsumed coal face. The injection point is moved sequentially around the perimeter of a coal removal area from a production well to sweep out the area to cause the controlled bending subsidence. The injection holes are drilled vertically into the coal seam ...
DOEpatents
The influence of climate change on fluvial incision and terrace formation has received greater attention in the past several decades, especially as the precision, accuracy, and techniques of innovative dating methods have been refined. Evidence has recently been reported from several studies within or near glaciated terrain that suggests the timing and cyclic nature of ...
The effects of increasing agricultural land use on fluvial morphology have received much attention in fluvial research. However, in several regions in Europe, a reversing trend of decreasing agricultural activity and land abandonment, followed by reforestation, is observed. The response of fluvial morphology deserves attention because of its large impacts on landscape and ...
of distant rivers in the same region incite us to presume that analogous external changes may cause analogous river bedload. We can observe several inset terraces (T4 and T5) of the same kind beneath T3 abandonment, the river could never again form a valley bottom wider than about 1 km. Levels T3 and T4 can
This radio broadcast features the 'Megatransect' a 1,250 mile survey through uninhabited territory in the republic of Congo, Cameroon and Gabon. The researcher, Dr. Michael Fay of the Wildlife Conservation Society, followed elephant paths, crossed swamps, jungle, mountain ranges, terraced fields abandoned during the slave trade, and traversed hundreds of ...
NSDL National Science Digital Library
As a part of the coal mining and restoration research, a steeply sloped, forty acre pasture site of low agricultural productivity was chosen for Iowa Coal Project Demonstration Mine No. 1. During mining, 110,000 tons of coal were removed, impact on the surrounding environment was kept at a minimum and the site was restored to a series of level benched terraces suitable for ...
After the 1999 Chichi Earthquake, several active structures are well study at the fold-and-thrust belt in western Taiwan. Some of these morphological marks (e.g. alluvial fan, river terrace, etc.) and tectonic characteristics have been observed from the surface deformation. But there are still many cases where the geometry and kinematics of the active faults and growth folding ...
Logging roads fundamentally alter landscape processes. Their effects on erosion, land stability, and vegetation patterns are clear; however, their effects on subsurface hydrologic flow patterns are less researched and not as well understood. We present field measurements and numerical modeling to assess the impacts of logging roads and road removal approaches on hydrologic processes on the ...
The Western Kunlun, which bounds north-western Tibetan Plateau, is one of the largest mountain range of Asia, with altitudes peaking at 6500-7500 m asl, and crustal thicknesses of up to ~70 km. North of the plateau, in the foreland of the range, an active fold-and-thrust belt extends 200 km into the Tarim basin, but remains poorly documented regarding amounts of shortening or deformation rates. We ...
The Hillside neighborhood plan, one of six, presents the aspirations of Bayview area residents in several different forms. The reiteration of ideas is deliberate, for the plan is designed to be used as a quick reference, not a volume to be read through fr...
Landscape response to alternations of climate induces periods of enhanced sediment supply to rivers during cold climate, promoting valley widening and strath formation while incision rate is reduced. During these periods, rivers are aggrading and usually show a braided pattern. The transition from valley widening to downcutting leads to formation of the climatic-aggradation fluvial ...
The Classical and early Hellenistic settlement located at Adjiyska Vodenitsa, near Vetren, in the centre of ancient Thrace, is somewhat unusual in displaying well-preserved evidence for the commercial and cultural interactions associated with a river port. The settlement evolved through a series of phases, with traces of activity emerging around the beginning of the fifth, advancing to a ...
Abandoned fluvially eroded bedrock surfaces (strath terraces) are used ubiquitously as indicators of past river elevation. However, little is known about how, why and over what time period they form. Consequently, dates of strath surfaces, or overlying gravels, can be difficult to interpret without a more mechanistic understanding of strath genesis. We ...
The active, left-slip Altyn Tagh Fault (ATF) defines the northern boundary of the Tibetan Plateau and is among the world's longest intracontinental strike-slip faults. Despite a decade of concentrated work, the Holocene slip rate for the central ATF is still disputed, with millennial slip rates derived from faulted landforms ranging from 9 to 27 mm/yr. To address this factor-of-three difference, ...
In this report, local electronic structures of steps and terraces on rutile TiO(2) single crystal faces were studied by second harmonic and sum frequency generation (SHG?SFG) spectroscopy. We attained selective measurement of the local electronic states of the step bunches formed on the vicinal (17 18 1) and (15 13 0) surfaces using a recently developed step-selective probing ...
In semi-arid landscapes vegetation succession on abandoned agricultural land is a long lasting process due to the water deficit for the best time of the year. During this phase of succession, geomorphic processes like the formation and development of rills, gullies and other geomorphic processes lead to a more or less constant deterioration of the ...
Three areas were investigated to determine their suitability as anchor sites for the Ocean Thermal Energy Conversion (OTEC) test platform. Required were a flat, 800 to 1500-meter deep bottom with an area 5 km in diameter that was in reasonable proximity of a land based logistics supply station. Of the three areas, Maui terrace, South Point, Hawaii, and Kohala ...
Geomorphic research in the Black Hills and northern High Plains poses an intriguing hypothesis for the Cenozoic evolution of this salient of the Laramide Rockies. Most recently, geologists have appealed to late Cenozoic epeirogenic uplift or climate change to explain the post-Laramide unroofing of the Rockies. On the basis of field mapping and the interpretation of long-valley profiles, we ...
