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Thursday, July 23, 2020 | History

5 edition of Erosion, debris flows, and environment in mountain regions found in the catalog.

Erosion, debris flows, and environment in mountain regions

Erosion, debris flows, and environment in mountain regions

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Published by International Association of Hydrological Sciences in Wallingford, Oxfordshire, UK .
Written in English

    Subjects:
  • Erosion -- Congresses,
  • Debris avalanches -- Congresses,
  • Erosion -- Environmental aspects -- Congresses,
  • Debris avalanches -- Environmental aspects -- Congresses

  • Edition Notes

    Statementedited by D.E. Walling, T.R. Davies, B. Hasholt.
    SeriesIAHS publication ;, no. 209
    ContributionsWalling, D. E., Davies, Timothy R. H., Hasholt, Bent., IAHS International Commission on Continental Erosion., International Symposium on Erosion, Debris Flows, and Environment in Mountain Regions (1992 : Chengdu, China)
    Classifications
    LC ClassificationsQE598 .E76 1993
    The Physical Object
    Paginationx, 485 p. :
    Number of Pages485
    ID Numbers
    Open LibraryOL1461441M
    ISBN 100947571388
    LC Control Number93118891

    debris-flow deposits going back to the Pleistocene, we were able to draw inferences about recurrence intervals and the geomorphic role of debris flows in this semiarid mountain range. Debris flows are slurry flows of poorly-sorted rock and soil debris mixed with % water (Costa, ). Debris flows . An empirical model for predicting deposition of coarse-textured debris flows in confined mountain channels is devel-oped based on field measurements of 14 debris flows in the Pacific Northwest, U.S.A. The model uses two criteria for deposition: channel slope (less than °) and tributary junction angle (greater than 70°). The model is tested by.

    Episodic debris flows scour the rock beds of many steepland valleys. Along recent debris-flow runout paths in the western United States, we have observed evidence for bedrock lowering, primarily by the impact of large particles entrained in debris flows. This evidence may persist to the point at which debris-flow deposition occurs, commonly at slopes of less than??? Appalachian Mountains - Appalachian Mountains - Geology: The Appalachians are among the oldest mountains on Earth, born of powerful upheavals within the terrestrial crust and sculpted by the ceaseless action of water upon the surface. The two types of rock that characterize the present Appalachian ranges tell much of the story of the mountains’ long existence.

      Appalachia’s Strip-Mined Mountains Face a Growing Climate Risk: Flooding. A new analysis of satellite images shows how the area of West Virginia with . Accelerated soil erosion is a common and environmentally destructive consequence of development, especially in mountain regions. Soil erosion is of special concern in agricultural lands, but agriculture is only one of many development activities that greatly accelerates soil erosion processes. Road building, trail use, excavation, extractive activities, and construction also can cause severe.


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Erosion, debris flows, and environment in mountain regions Download PDF EPUB FB2

Proceedings of the International Symposium on Erosion, Debris Flows, and Environment in Mountain Regions.

"Proceedings of the international symposium held at Chengdu, China, July The symposium was organized by the International Commission on Continental Erosion of the International Association of Hydrological Sciences [and others].". Get this from a library. Erosion, debris flows and environment in mountain regions.

[D E Walling; Timothy R H Davies; Bent Hasholt; IAHS International Commission on Continental Erosion.; Zhongguo ke xue yuan. Institute of Mountain Disasters and Environment.;]. An International Symposium on Erosion, Debris Flows and Environment in Mountain Regions will be held July 5–9,in Chengdu, China.

The symposium is jointly organized by the International Association of Hydrological Sciences and the Institute of Mountain Disasters and Environment, Chinese Academy of Sciences, in cooperation with the International Union of Forestry Research Organizations.

This volume contains 55 papers from 25 countries. The Symposium focussed on steepland and mountain environments with particular regard to debris flow and environmental degradation in areas bordering the Pacific Rim.

Vegetation succession, soil degradation, land restoration, the measurement and prediction of soil erosion, the dynamics of debris flow and related phenomena, and slope.

Erosion, Debris Flows and Environment in Mountain Regions (Proceedings of the Chengdu {R. Ziemer}, title = {Erosion, Debris Flows and Environment in Mountain Regions (Proceedings of the mountain region debris flow data collection caspar creek experimental watershed and environment in mountain regions book forest.

Rim. The International Symposium on Erosion, Debris Flows and Environment in Mountain Regions, which is debris flows be held in Chengdu, China, in July is the sixth meeting in this informal series which was initiated with the Symposium on Erosion and Sediment Transport in Pacific Rim Steeplands (IAHS Publication no.

), held. Erosion, Debris Flows and Environment in Mountain Regions (Proceedings of the Chengdu Symposium, July ). IAHS Publ.Characteristics of erosion and deposition from debris flows WU JISHAN Institute of Mountain Disasters and Environment, Chinese Academy of Sciences, PO BoxChengdu, SichuanChina.

For example, the debris flows in Wenjia gully (Sichuan Province, China) after the Wenchuan earthquake were formed by the following sequence of events: runoff, erosion, collapse, engulfment. Heavy rainfall, snowmelt, or high levels of groundwater flowing through cracked bedrock may trigger a movement of soil or sediments.

Floods and debris flows may also occur when strong rains on hill or mountain slopes cause extensive erosion and/or what is known as "channel scour". The Sidoarjo mud flow may have been caused by rogue drilling. Some broad mudflows are rather viscous and.

Debris flows, occurring in the mountain region from May to September, are most widespread and destructive. At elevations above m a.s.l., where vegetation becomes sparse, debris cover may reach a thickness of tens of metres providing material for debris flows (Seinova, ).

Particularly prone to hydro-geological hazard is the uppermost. CMFs in the glacier environment have been responsible for a number of major natural disasters in mountain regions since These events include the Huaraz disaster, Peru (Figure ; Oppenheim,Heim,Carey,Carey, ), the Huascarán mass flows of andPeru (Evans et al., a), the Kolka Glacier event ofRussia (Haeberli et al.

The super strong erosion by debris flows happened at these inflexion points such as Zhouqu event of August 8, and Qingping event of Aug in the western China greatly reduced the.

Two chapters are devoted to the particular characteristics of glaciation and vulcanism in mountain formation. The book concludes with a discussion of the special problems that human use of mountain regions create, including engineering, natural hazards, soil erosion, and the.

Landslides over steep slopes, floods along rivers plains and debris flows across valleys are hydrogeological phenomena typical for mountain regions.

Such events are generally triggered by rainfall, which can have large variability in terms of both its intensity and volume. Furthermore, terrain predisposition and the presence of some disturbances, such as wildfires, can have an adverse effect.

The erosion and deposition of debris flows at Jiangjia Gully in Dongchuan section of Yunnan province, southwestern China, was surveyed at 12 cross sections from to Deposition occurred in most sections because of the low debris-flow magnitude. The result was an increase in their elevations except for two sections at D17 and D19, where the channel was diverted in September Over much of the world the erosion of landscape, including the reduction of mountains and the building of plains, is brought about by the flow of water.

As the rain falls and collects in watercourses, the process of erosion not only degrades the land, but the products of erosion themselves become the tools with which the rivers carve the valleys in which they flow. Such debris flows deliver substantial sediment to lower gradient reaches of wadis or to tributary mountain channels (Figure 5e).

If these debris flows occur above road cuts, they may entrain intact or failed material from cut and fill slopes and can exacerbate or initiate failures in cut and fill materials (Youssef et al., d). As such. With Australia's Hillsides Stripped Bare By Fire, Scientists Rush To Predict Mudflows Heavy rains in eastern Australia are causing mudslides and debris flows in areas that burned.

Scientists are. If uplift had occurred without erosion, a great dome, somewhat like that illustrated by the broken lines of the profile (fig. 2, p. 16), but more or less warped and broken, with surface cracked and uneven, would now stand in place of the highly varied complex of peaks, ridges, and gorges which characterize the mountain region.

including rockfalls, rockslides, and debris flows, that pose a geologic hazard to people and property in the Khumbu region. 1, Indeed, it has been documented that earthquakes often trigger landslides and avalanches of all sizes.

9 Understanding the glacial and geomorphological. Through time, erosion progressively carves canyons into mountainous areas. Mountain stream channels are self-perpetuating; as water gathers into rills and channels, the greater the flow, the greater the erosive force.

Likewise, streams with steep drainage profiles are capable of moving more material.Rill erosion refers to the development of small, ephemeral concentrated flow paths which function as both sediment source and sediment delivery systems for erosion on hillslopes.

Generally, where water erosion rates on disturbed upland areas are greatest, rills are active. Flow depths in rills are typically of the order of a few centimetres (about an inch) or less and along-channel slopes may.Relation to Lithology and Environmental Controls Mass Movements: Introduction Landslides and Rockfalls Rapid Flows of Wet Debris Creep Overland Flow: General Runoff Erosion Lithology and Form Climate and Form Examples of Slope Forms in Different Regions Spitzbergen and Scandinavia Central Appalachian Mountain Region Hawaii Southern Sudan.