|
|
Dendrochronological dating of catastrophic slope movements
Tumajer, Jan ; Treml, Václav (advisor) ; Burda, Jan (referee)
Mass-movements are one example of natural processes that can pose a serious risk for human beings and their possessions. Dendrochronology, a method capable of their reconstruction, can provide parameters of former events, which can be used for planning protective measures. The possibilities for the application of dendrochronological methods have been tested by means of meta-analysis of electronic and printed scientific articles and a case study focused on former avalanche activity in Schustler's avalanche path (Labský důl, Krkonoše Mts.). The main conclusion of the first one is the clear spatial disproportion of the recent dendrogeomorphological research activities - e.g. the dating of avalanches is typical for mountains of Montana (USA); the Alpine region (mainly Switzerland), on the other hand, absolutely dominates in the research of debris-flows. In the case study, the analysis of material with well-chosen indicators led to high accuracy results comparable with the results of scientific articles focused on avalanches, and made the identification of 14 years (in the period 1953-2007) with potential avalanche acitvity possible. Although methods of dendrogeomorphology are usually neglected in the research of avalanches in the Czech republic, their great potential for future applications is shown....
|
|
|
Debris flows as a result of environmental changes in midmountains of the Cenral Europe, case study in the Hrubý Jeseník Mts.
Raschová, Tereza ; Křížek, Marek (advisor) ; Hartvich, Filip (referee)
This work determines on the basis of literature according to its objectives the definition of the debris flows, an overview of their types and description of the genesis and morphology. Debris flows are mass movements with high rate of speed, caused by atmospheric conditions (intense precipitation, melting snow) or geomorphological events (sudden burst of water pockets, burst of moraine or ice dammed lakes) in mountainous areas that move down the valley along torrential chanels or along slopes and pull down everything in their path. We distinguish between structural and turbulent debris flows. In case of structural ones the water is creating an envelope of the debris. Their genesis is conditioned by supersaturation of weathered soil with water and the movement is created by gravity. The turbulent debris flow are formed by water which is not able to be absorbed and the water pulls down the debris on slopes and in the channels. Material is transported in suspension. I compared some debris flows from different mountains and it is quite complex to define specific values of parameters that cause debris flows. Structural debris flow in this study originated on rocks with a high content of micas or on sandstones. Turbulent debris flows originated on granitoids. Precipitation should have higher intensity...
|
|
|
Debris flows as a result of environmental changes in midmountains of the Cenral Europe, case study in the Hrubý Jeseník Mts.
Raschová, Tereza ; Křížek, Marek (advisor) ; Hartvich, Filip (referee)
This work determines on the basis of literature according to its objectives the definition of the debris flows, an overview of their types and description of the genesis and morphology. Debris flows are mass movements with high rate of speed, caused by atmospheric conditions (intense precipitation, melting snow) or geomorphological events (sudden burst of water pockets, burst of moraine or ice dammed lakes) in mountainous areas that move down the valley along torrential chanels or along slopes and pull down everything in their path. We distinguish between structural and turbulent debris flows. In case of structural ones the water is creating an envelope of the debris. Their genesis is conditioned by supersaturation of weathered soil with water and the movement is created by gravity. The turbulent debris flow are formed by water which is not able to be absorbed and the water pulls down the debris on slopes and in the channels. Material is transported in suspension. I compared some debris flows from different mountains and it is quite complex to define specific values of parameters that cause debris flows. Structural debris flow in this study originated on rocks with a high content of micas or on sandstones. Turbulent debris flows originated on granitoids. Precipitation should have higher intensity...
|
|
|
Dendrochronological dating of catastrophic slope movements
Tumajer, Jan ; Treml, Václav (advisor) ; Burda, Jan (referee)
Mass-movements are one example of natural processes that can pose a serious risk for human beings and their possessions. Dendrochronology, a method capable of their reconstruction, can provide parameters of former events, which can be used for planning protective measures. The possibilities for the application of dendrochronological methods have been tested by means of meta-analysis of electronic and printed scientific articles and a case study focused on former avalanche activity in Schustler's avalanche path (Labský důl, Krkonoše Mts.). The main conclusion of the first one is the clear spatial disproportion of the recent dendrogeomorphological research activities - e.g. the dating of avalanches is typical for mountains of Montana (USA); the Alpine region (mainly Switzerland), on the other hand, absolutely dominates in the research of debris-flows. In the case study, the analysis of material with well-chosen indicators led to high accuracy results comparable with the results of scientific articles focused on avalanches, and made the identification of 14 years (in the period 1953-2007) with potential avalanche acitvity possible. Although methods of dendrogeomorphology are usually neglected in the research of avalanches in the Czech republic, their great potential for future applications is shown....
|
|
| |
|
| |
guest ::
