Mise en place et évolution du réseau hydrographique de la Hamada du Guir au Quaternaire (Sahara septentrional) (Settlement and evolution of the Ghir Hamada hydrographic network during the Quaternary, northern Sahara)

1990 ◽  
Vol 67 (1) ◽  
pp. 61-73
Author(s):  
C. Cornet
Keyword(s):  
Hydrographic Network

scholarly journals Selection of the assortment of trees for protective forest plantations

2020 ◽  
Author(s):  
A.I. Petelko ◽  
Keyword(s):  
Species Composition ◽  
Tree Species ◽  
Effective Means ◽  
Water Erosion ◽  
Current Status ◽  
Forest Plantations ◽  
Forest Stands ◽  
Protective Forest ◽  
Selection Of ◽  
Hydrographic Network

Reclamation of land on community land funds and the hydrographic network contributes to the most effective means of protecting the soil from water erosion. However, the condition, growth, and productivity of the protective forest stands themselves depend on the species composition. Many years of studies have clearly shown that not all tree species and shrubs can successfully grow on washed soils. Extensive scientific material provides a description of the growth and current status of the studied species, a detailed taxation description of the forest plantations. Of particular value are those species that can grow on eroded lands and protect the soil from erosion.

scholarly journals Changes to the structure of the hydrographic network within the Silesia-Cracow area of zinc and lead exploitation

2017 ◽  
Vol 5 (2) ◽  
pp. 37-48
Author(s):  
Alicja Pradela ◽  
Andrzej Zygmuniak
Keyword(s):  
Aquatic Environment ◽  
Drainage Density ◽  
Open Pit ◽  
Hard Coal ◽  
Mining Activities ◽  
Iron Ores ◽  
Open Pit Mines ◽  
Hard Coal Mining ◽  
Quantitative Changes ◽  
Hydrographic Network

Abstract The traditions related to mining activities in the Silesia-Cracow area go back to the 11th century when lead, silver, and iron ores were exploited from open pit mines. For centuries, the growth in ore exploitation was an incentive for the development of other industries (hard coal mining, steelmaking). This, in consequence, resulted in progressive urbanization. The areas analyzed are of highly transformed character, mainly because of mining activities. These changes are especially seen in relation to the aquatic environment since this component is exposed to heavy modifications due to the mining processes. Hence the study was carried out in order to determine the quantitative changes in the surface hydrographic network. It was found, that of the 62 main watercourses (existing during the whole analyzed period) 25 changed only slightly in terms of their length, 20 shortened by a few hundred meters and 17 lengthened. In the case of the aggregated length of the tributaries, the value increased for the 41 main watercourses, for 10 of them it was constant and was reduced slightly for a further 11. The areas where the length of the watercourses increased and the drainage density grew were found to be as well those where the total area of wetlands decreased. The element of the hydrographic network which was affected by the most changes was the water bodies. During the analyzed period of over 200 years, their number increased from 154 to 1413.

scholarly journals Fish fauna of small streams of the Catua-Ipixuna Extractive Reserve, state of Amazonas, Brazil

Check List ◽  
2009 ◽  
Vol 5 (2) ◽  
pp. 154 ◽  
Author(s):  
Renildo Ribeiro de Oliveira ◽  
Marcelo Salles Rocha ◽  
Maeda Batista dos Anjos ◽  
Jansen Zuanon ◽  
Lúcia H. Rapp Py-Daniel
Keyword(s):  
Species Richness ◽  
Fish Species ◽  
Fish Fauna ◽  
Conservation Unit ◽  
Extractive Reserve ◽  
Small Streams ◽  
Total Fish ◽  
Amazonas State ◽  
Solimões River ◽  
Hydrographic Network

This study was conducted in an Amazonas state conservation unit, the Catuá-Ipixuna Extractive Reserve (Catuá-Ipixuna RESEX). The main purpose was to provide an ichthyological survey of its small streams, all them tributaries of the Solimões River. Nine small streams (up to 4 m width and 1 m depth) were sampled in September 2006. A total of 1,525 specimens were captured, belonging to 78 species, 24 families and eight orders. Eight species had higher abundances and represented altogether 61.4 % of all collected specimens (Hemigrammus belotii, Microphilypnus amazonicus, Physopyxis ananas, Apistogramma agassizii, Elachocharax pulcher, Apistogramma cf. cruzi, Gladioglanis conquistador and Copella nigrofasciata). Based on the high number of singletons and doubletons present in our samples, as well as the estimated number of species for those streams (106 spp.), we believe that the total fish species richness present in the Catuá-Ipixuna Extractive Reserve may be considerably higher than indicated by our samples. This seems especially true when considering the dimensions of the Catuá-Ipixuna RESEX and the dense hydrographic network present in the area.

scholarly journals Approaches to Visibility and Strategical Control of the Sierra Harana Schematic Rock Art (Granada, Spain)

2021 ◽  
Vol 31 ◽  
pp. 27-44
Author(s):  
Marcos Fernández Ruiz ◽  
Fernando Corbacho Gadella ◽  
Liliana Spanedda ◽  
Alberto Dorado Alejos
Keyword(s):  
Information Systems ◽  
Geographic Information Systems ◽  
Rock Art ◽  
Geographic Information ◽  
Neolithic Period ◽  
Strong Link ◽  
Water Springs ◽  
The Relationship ◽  
Hydrographic Network ◽  
Rock Shelters

An approach about territorial control and mobility in Sierra Harana (Granada, Spain) during Late Prehistory is presented in this paper, according to rock shelters with schematic rock art distribution. Different aspects have been analysed by using tools provided by Geographic Information Systems (GIS): the relationship between rock shelters and hydrographic network and water springs, and, mainly, their visual control. The association between rock shelters with schematic rock art and burial caves use during the Neolithic period is observed in the study area. A strong link between rock shelters and traditional pathways is also attested. These facts can be read as a way to mark symbolically certain routes that could be aimed to short transhumance practice. 

scholarly journals Hydrographic network extraction and watersheds delimitation software of the South Oran (North Wester Algeria)

2018 ◽  
Vol 10 (1) ◽  
pp. 35
Author(s):  
A. Ayache ◽  
A.R. Bennia ◽  
S. Lebid ◽  
B. Hellal ◽  
A. Maacho
Keyword(s):  
The South ◽  
Hydrographic Network

scholarly journals Analysis of the flooding event of October 22-23, 2005 in a small basin in the province of Bari (Southern Italy)

2016 ◽  
Vol 47 (4) ◽  
pp. 197 ◽  
Author(s):  
Tiziana Bisantino ◽  
Vincenzo Pizzo ◽  
Maurizio Polemio ◽  
Francesco Gentile
Keyword(s):  
Southern Italy ◽  
High Water ◽  
Ephemeral Streams ◽  
Hydraulic Modelling ◽  
Flooding Event ◽  
Hydraulic Safety ◽  
The City ◽  
Water Depths ◽  
Small Basin ◽  
Hydrographic Network

In the province of Bari the hydrographic network consists of ephemeral streams called lame. In these watercourses the absence of runoff for long periods contributed to unfounded beliefs concerning the hydraulic safety of the landscape and therefore uncontrolled changes in streambeds and floodplains. In these streams high water discharges can occur during heavy rainfalls, as demonstrated by the floods that hit the city of Bari in the late nineteenth and early twentieth century. The flooding event of October 22-23, 2005 can be considered catastrophic as it resulted in six deaths, numerous injuries and substantial damage sustained by road and railway infrastructures at the intersection with the hydrographic network. This study aims to analyse the severity of the event in terms of the response of the landscape with reference to the case of the lama Scappagrano basin, where a Eurostar train derailed due to the collapse of the railway embankment. Coupled hydrological and two-dimensional hydraulic modelling was performed to reconstruct the flood hydrograph and water depths on the upstream side of the embankment. The results were used to set the boundary conditions to analyse the internal stability of the embankment using a finite element method.

scholarly journals Urban Regeneration Projects Bound to Water, along and towards the Tagus Estuary (Portugal)

2019 ◽  
Vol 11 (23) ◽  
pp. 6578
Author(s):  
Caterina Anastasia
Keyword(s):  
Public Space ◽  
Urban Regeneration ◽  
Tagus Estuary ◽  
Open Spaces ◽  
The North ◽  
Surrounding Areas ◽  
The City ◽  
North And South ◽  
Hydrographic Network

Water is becoming a support for landscape and urban projects in a densely urbanised area settled along the Tagus Estuary, dubbed the City of the Tagus Estuary (CTE). Analysing two recent projects along and towards the Tagus Estuary hydrographic network, this article highlights how the most evident limit (the water) can function as the strongest binder, natural link, and shared public space of the CTE. Located, respectively, on the north and south banks of the estuary, the analysed projects become a way to think about urban strategies and promotions that use water as a way to build (re-build or reformulate) the image of the Lisbon Metropolitan Area. Today, open spaces bound to waterlines support an appealing and winning urban regeneration formula. Our goal is to understand what kind of role water is called to play with regard to the CTE. We ask: is the water called to play merely the role of building a new image of the city as a ground for investors? Is water the way to build a green and habitable CTE? This article concludes that the analysed projects contribute (as expected) to the promotion of the surrounding areas and propose appropriate solutions while occasionally overcoming the current local urban planning.

scholarly journals Stream Power Determination in GIS: An Index to Evaluate the Most ’Sensitive’Points of a River

Water ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1145 ◽  
Author(s):  
Pierluigi De Rosa ◽  
Andrea Fredduzzi ◽  
Corrado Cencetti
Keyword(s):  
Methodological Approach ◽  
Main Stream ◽  
Stream Power ◽  
Digital Elevation ◽  
Original Definition ◽  
Study Support ◽  
Solid Transport ◽  
Gis Environment ◽  
Standardized Screening ◽  
Hydrographic Network

This paper focuses on the problem of measuring stream power in a hydrographic network using the original definition provided by Bagnold in 1996. Recent digital elevation models have enabled the calculation of channel gradients and, consequently, stream power with a finer spatial resolution, and this has created promising and novel opportunities to investigate river geomorphological processes and forms. The work carried out in this study includes defining and implementing a methodological approach that could be automated within a geographic information system and that meets two requirements: (1) it uses a DEM as input data at a suitable resolution; (2) it estimates the stream power Ω , as well as its variability along the considered stream, in the best possible way using available data. In particular, the methodological approach was implemented in a GIS environment (GRASS GIS) and applied to a sample basin to highlight the variability in Ω along the main stream and its most important tributaries. The sudden and more substantial variations in stream power were then related to the processes acting in the fluvial system. This approach made it possible to highlight how erosion, solid transport, and sedimentation phenomena occurring along the fluvial reaches are related to abrupt variations (increase/decrease) in the “power” available. The results of this study support the idea that the automated and standardized screening of stream power variability along a stream can be used as a preliminary diagnostic element to identify the most “sensitive” points of the stream on which to concentrate subsequent investigations (field checks to verify the causes), with the aim of mitigating risks due to the dynamics of the riverbed.

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