نتایج جستجو برای: permanent gullies
تعداد نتایج: 62766 فیلتر نتایج به سال:
Geo-hydrological phenomena, including gullies, contribute significantly to soil erosion and land degradation. To address this, proper management of basins hillslopes should consider the mechanism, timing, location gully development how gullies interact with other hillslope processes. Yet, conventional modelling techniques for such processes are rare, frequently being limited applications only s...
Considering the linear erosion processes in river basins slopes it can be noticed that gully is most intensively changing relief, leading to complete soil cover destruction, and making land not suitable for agricultural use. The latest maps of gullies'development Russia were compiled more than 50 years ago seen as very outdated. Since time no comprehensive gullies network mapping has been carri...
Incision as a result of fluvial erosion is an important process to model when simulating landform evolution. For gullies, it apparent that coupled with the processes cause incision there must be range stop incision. Once started, rills and gullies will grow infinitely without reduction in support area and/or being arrested by deposition armouring. Some these have been well studied under heading...
The development of a soilless crop culture system based upon the Nutrient Film Technique (NFT) was studied. The conventional polythene gullies used for the NFT in temperate regions were found not ~uitablefor .the ho! tropical -climate. An insulated NFT shallow trough desz~n was effective in controllzng heat buzld up In the root zone. Muskmelon, vegetables and ornamental plants were successfully...
In this study we describe the first apterous species of Endecous Saussure (1878), collected in two caves at Ituaçu, Bahia State, Brazil. In Brazil, Endecous is the most widespread cricket in hypogean environments and its species can colonize caves and inhabit the entrance and the aphotic zones; Endecous species can also be found in the litter, rock gullies, crevices, burrows, and any natural ca...
M easurements of topography can provide a wealth of information on landscape properties fw managing hydrologic and geologic systems and conserving natural and agricultural resources. This article discusses the application of an airborne laser altimeter to measure topography and other landscape surface properties. The airborne laser altimeter makes 4000 measurements per second with a vertical re...
Fires in the ecosystems of Central Kazakhstan trigger a pyrogenic succession for 1-2 decades as usual. In recent years, changes climate and land use region have led to intensification fires gradual steppification territory, where desert vegetation was previously successfully restored. We analyzed change aboveground phytomass stocks during 40 years succession. zonal communities, reaches backgrou...
We found that craters in the mid-latitudes of Mars possess a marked asymmetry, which is linked with the occurrence of gullies. We also found that a prerequisite for gully formation is the occurrence of steep slopes. The analysis was performed in three areas with elevation data from the High Resolution Stereo Camera (HRSC) on-board Mars Express. Figure 1: MOLA global map with our study sites mar...
Our main goal is to assess the hydrodynamics of turbidity currents and mudflows and their ability to produce morphological features such as ripples, dunes, antidunes and gullies along their paths. Of particular interest is to elucidate the role played by turbidity currents on the inception of submarine channels and canyons. To this end, understanding the mechanics of sediment erosion, including...
Figure 1. Left: Gully system in the ADV, consisting of alcove, channel and fan; wind-blown snow has collected in topographic traps (alcove, channels); summer melting causes flow and erosion/deposition. Right: Gully system on Mars. Transient streams and gullies in the Antarctic Dry Valleys: Geological setting, processes and analogs to Mars J. W. Head, D. R. Marchant, J. Dickson, J. Levy, and G. ...
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