Pleistocene history of the Nile Valley in Egypt and Lower Nubia in The Sahara and the Nile. Quaternary environments and prehistoric occupation in northern Africa.
Development-induced food insecurity in the Middle Senegal Valley
Drought ; Farming system ; Food ; Food resources ; Food security ; Hydraulic works ; Irrigation ; Senegal ; Valley ; Water resources
The middle Senegal Valley has a low rainfall sahelian climate which has made dryland agriculture exceptionaly problematic during the past 25 years. Irrigation has been a welcomed addition to the productive spectrum of the valley. The Mamnantali Dam
Linear dune pattern variability in the vicinity of dry valleys in the southwest Kalahari
Aeolian features ; Aerial photography ; Arid area ; Barchan ; Botswana ; Dune ; Geomorphometry ; Kalahari ; Palaeo-environment ; Valley ; Wind
This paper describes the main association between dunes and valleys which occur in the southwest Kalahari dunefield and to review current explanations from localised dune pattern evolution and development in this and other dunefields of low relative
relief. The study is based upon a combination of field observations, analysis of aerial photographs and map interpretation of the dunes within 10 km of the major valleys which dissect the southwest Kalahari dunefield.
Glacial geomorphology of Bonney drift, Taylor valley, Antarctica
by Taylor Glacier of Bonney drift in central Taylor Valley. Bonney drift is important because it records the penultimate advance of Taylor Glacier through central and lower Taylor Valley.
The aim of this paper is to document the response of the East Antarctic Ice Sheet (EAIS) near the Dry Valleys to the excess warmth of the last interglaciation by establishing the behavior of Taylor Glacier. The AA. present a model for the deposition
The alluvial deposits which fill the low Tiber River Valley show a morphology characterized by wide discontinuous terraces raising up till more than 200 m above the thalweg. Moreover the inner borders of all the terraces belonging to both the valley
floors and the valley sides show elevation values which are recurrent and identical to elevation values of upper Pleistocene marine terraces scattered over all the world. From these results one may claim that terraces of the Tiber Valley, here discussed
Charakter udolni a erozni site severni casti Trojmezenské hornatiny Character of the valley and erosion network of the northern part of the Trojmezenska hornatina Mts
The geomorphological development of the Upper Vltava valley in the Central Sumava (Mountains), until the Lower Pliocene. The comparison of the longitudinal profiles makes clear the young tectonic movements decreasing from E. to W. (MS).
Heavy minerals as a stratigraphical tool for the Eemian and Post-Eemian deposits in the lower Lys valley (Belgium)
The lithostratigraphic units in the Upper-Pleistocene Lys valley may be subdivided into two distinct populations, each with its own characteristic heavy mineral assemblage. The Eemian and Early Weichselian sediments originate mainly from the erosion
Genesis of active sand-filled polygons in lower and central Beacon Valley, Antarctica
Antarctique ; Coin de glace ; McMurdo Dry Valleys ; Pergélisol ; Périglaciaire ; Région polaire ; Sol figuré ; Zone froide
In this study, the AA. describe and characterise sand-filled wedges and polygons and propose a descriptive model for their formation in lower and central Beacon Valley from detailed analysis of a 2-m resolution aerial photography and other
Dammed lake ; Degradation ; Floodplain ; Hydraulic works ; Lowervalley ; Natural environment ; Poland ; Valley ; Wisła
The article presents changes in the natural environment of the bottom of the lower Vistula valley, as resulting from its hydrotechnical development. An assessment has been made of the degree of degradation of the floodplain zone behind
the embankment, this resulting first and foremost from a process of downcutting erosion within the channel, and later from a lowering of the water table and management of the area. A steadily increasing threat of the Włcławek Reservoir dam being breached
to cascade construction of the valley floor within the floodbanks, as well as appropriate hydrotechnical measures beyond those banks, it should be possible to achieve renaturalisation of the degraded flood level. - (BJ)
Soils and geomorphology of the lower Little Cedar River valley, northeast Iowa
Alluvium ; Floodplain ; Fluvial terrace ; Geomorphology ; Holocene ; Iowa ; Pleistocene ; Quaternary ; Sedimentology ; Soil ; Stratigraphy ; United States of America ; Valley
The AA. investigated the alluvial stratigraphy, soils, and geomorphology along a section of the lower Little Cedar River to aid in understanding the processes forming this landform region. They used terrace- and floodplain surface height above
the Little Cedar River, soil development, sedimentological characteristics, and stone lines to distinguish alluvial units and landforms. Three Pleistocene surfaces were mapped in the valley, including two terraces and an erosion footslope. Holocene alluvial
Municipal annexation and the selective underbounding of colonias in Texas’ Lower Rio Grande Valley
This article project explores the prevalence of the municipal underbounding of colonias in the Lower Rio Grande Valley (LRGV) of Texas. It begins with a description of regional demographic and socioeconomic characteristics, municipal growth
of being annexed that are lower still. The paper concludes with a discussion of the policy implications of these findings.
Rock strength and development of glacial valley morphology in the Scottish Highlands and northwest Iceland
Geomorphogenesis ; Glacial erosion ; Glacial valley ; Highland ; Ice sheet ; Iceland ; Lithology ; Model ; Rock mechanics ; Scotland ; United Kingdom ; Valley
of low rock mass strength, broad U-shaped valleys are developed, whilst steeper sided, narrower cross-profiles have been developed on igneous bedrock of high rock mass strength. Findings suggest it is the interplay of the mass strength of the subglacial
Using data from the Scottish Highlands and northwest Iceland, this study indicates that bedrock strength properties are an important control on the morphology of glacial valleys. Results indicate that on closely jointed metasedimentary bedrock
bedrock and he dynamic properties of the eroding glacier that control valley morphological development.