Academic literature on the topic 'Basin Hydrographic'

A study of climate Siret River Basin within the Chernivtsi region. Designated hydrographic and hydrometric characteristics of rivers. The relationship between climatic conditions and the hydrographic network and the regime of surface water basin of the Upper Siret. Key words: river basin; climate; surface water; hydrological regime.

In this paper we supplement Greece’s recent annotated inventory of freshwater fishes per hydrographic basin with recent distributional data and taxa alteration information, based on field sampling and a literature review up to September 2011. We report on newly documented distributional records of 31 fish species plus one unidentified taxon, within 35 hydrographic river basin units in Greece. These new records include 14 native fish species, seven alien and 12 translocated. Translocated taxa are distinguished from aliens, in order to report species non-indigenous to a basin but native within the same ecoregion. Twelve hydrographic basin units are newly added to the roster of ichthyologically explored river basins following a previous basin-scale inventory method (the total is now 117). This review increases the number of Greece’s freshwater fish taxa to 167, since four new species are added to the list (Carassius langsdorfii, Neogobius fluviatilis, Telestes alfiensis, Millerigobius macrocephalus) and two are deleted (Salmo dentex, Barbus rebeli) due to taxonomic changes. Taxonomic changes will probably continue to alter the national list since phylogenetic research is ongoing on several taxa in many parts of the country

Atualmente, cerca de dois bilhões de pessoas carecem de acesso à água de qualidade. No Brasil, tal situação é agravada por questões geográficas, adensamento populacional e poluição. Considerando que a bacia hidrográfica é a unidade de planejamento ambiental no Brasil, pressupõe-se que a realização de seu manejo de forma adequada e aplicação das políticas correlacionadas favorecem a promoção dos usos múltiplos da água. O presente artigo visa fornecer uma visão geral da gestão de recursos hídricos, adotando a bacia hidrográfica como unidade de manejo, abordando aspectos básicos ligados aos recursos hídricos, o histórico do sistema de gestão de recursos hídricos brasileiro e apontar elementos que podem ser empregados no manejo de bacias hidrográficas. Os esforços destinados à gestão dos recursos hídricos no Brasil se iniciaram em 1934, o manejo das bacias hidrográficas deve ser pautado na implementação de estratégias conservacionistas, do saneamento ambiental e da promoção da articulação entre os instrumentos existentes. O processo de gerenciamento deve envolver todos os interessados e os recursos arrecadados com a cobrança pelo uso da água devem favorecer a condução das ações nas bacias hidrográficas. O Grau de Hemerobia consiste em uma ferramenta útil para verificar a influência da paisagem sobre a qualidade da água e eventuais desregulações dos ecossistemas. Water resource management and hydrographic basin management in Brazil: basic elements, historic and strategies A B S T R A C TCurrently, about two billion people lack access to quality water. In Brazil, this situation is aggravated by geographical issues, population density, and pollution. Considering that the hydrographic basin is the environmental planning unit in Brazil, we assumed that the performance of its management in an appropriate manner and application of related policies favors the promotion of multiple water uses. This article aims to provide an overview of water resources management, adopting the hydrographic basin as a management unit, addressing basic aspects related to water resources, the historic of the Brazilian water resource management system and pointing out elements that can be used in the management of hydrographic basins. Efforts destined to the water resources management in Brazil began in 1934, the management of hydrographic basins must be guided by the implementation of conservationist strategies, the implementation of environmental sanitation and promoting the articulation between the existing instruments. The management process needs to involve all stakeholders and the resources collected from charging for the use of water favors the conduct of actions in hydrographic basins. The Hemeroby Degree is a useful tool for verifying the influence of the landscape on water quality and possible deregulation of the ecosystems.Keywords: Aquatic Ecosystems; Management; Planning; Environmental Policy.

The geomorphology of the Htab river watershed is mainly guided by the action of the E-W Kasserine fault. This activity influenced the installed hydrographic system. To see the impact of neotectonic on the Htab river watershed, four morphometric indices were applied: the elongation ratio, the hypsometric curve, the hypsometric integral, and the asymmetry factor. The processing and calculation of these indices were based on global DEMs (Digital Elevation Models). The result obtained shows an important link between the activity of the Kasserine fault, the geomorphological behavior of the Htab river watershed and the hydrographic network. Field observations confirmed well these results.