scholarly journals ANÁLISE FISIOGRÁFICA DA BACIA DO RIO MONAPO – PROVÍNCIA DE NAMPULA – MOÇAMBIQUE

GEOgraphia ◽  
2021 ◽  
Vol 23 (50) ◽  
Author(s):  
Alécio Perini Martins ◽  
Daiane Ferreira Batista ◽  
João Batista Pereira Cabral

Neste artigo apresenta-se uma caracterização fisiográfica da Bacia Hidrográfica do Rio Monapo localizada na Província de Nampula – Moçambique, objetivando contribuir com a discussão sobre os sucessivos problemas com escassez de água potável na região. Os métodos e técnicas utilizados para o desenvolvimento da presente pesquisa, foram as análises empíricas realizadas em campo em novembro de 2016, levantamento fotográfico, análise morfométrica e mapeamento do meio físico utilizando geotecnologias. De acordo com os dados avaliados a bacia hidrográfica drena uma área de 8.047 km², percorrendo o território de nove distritos de Nampula (população estimada de 1.624.924 habitantes em 2015) em terrenos cristalinos, representados em sua maioria por gnaisses e granitos. O clima apresenta características semiáridas, sendo classificado como tropical seco com precipitações anuais entre 800 mm e 1000 mm. A paisagem é dominada por cultivos arbóreos e florestas decíduas com características savânicas, entremeados por cultivos de manga, caju, mandioca, milho, arroz e banana. A morfometria da bacia indica grande potencial de preservação dos recursos naturais, com baixa susceptibilidade a erosão e inundações. Considera-se que os problemas de abastecimento de água na província devem-se mais às características pluviométricas, sobretudo à concentração das precipitações de novembro a março e ao modelo de uso da terra do que às características morfométricas da bacia. É necessário que sejam adotadas medidas que favoreçam o armazenamento e a concentração de água em reservatórios artificiais, criando um sistema de regularização da drenagem aproveitando as águas precipitadas durante o verão.Palavras-chave: Análise morfométrica. Caracterização fisiográfica. Geotecnologias.PHYSIOGRAPHIC ANALYSIS OF THE WATERSHED OF MONAPO RIVER – NAMPULA PROVINCE – MOZAMBIQUEAbstract: The article presents a physiographic characterization of the watershed of Monapo River, located in Nampula Province – Mozambique, aiming to contribute to the discussion about successive problems with potable water in the region. Regarding methods and techniques it’s possible to highlight empirical analysis of the area accomplished in the field in November 2016, photographic survey, morphometric analysis and mapping of the physiography using geotechnologies. The watershed drains an area of 8.047 km², traversing the territory of nine districts of Nampula (estimated population of 1.624.924 inhabitants in 2015), in crystalline grounds, represented in its majority by gneisses and granites. The climate presents semi-arid characteristics, being characterized as dry tropical with annual rainfall between 800 mm and 1000 mm. Arboreal crops and deciduous forests with savanna characteristics, interspersed with mango, cashew, cassava, corn, rice and banana crops, dominate the landscape. The basin's morphometry indicates great potential for preserving natural resources, with low susceptibility to erosion and flooding and a greater tendency for water to infiltrate. The water supply problems in the province are due more to rainfall characteristics, especially the concentration of rainfall from November to March and to the land use model than to the morphometric characteristics of the basin. It is necessary to adopt actions that favor the storage and concentration of water in artificial reservoirs, creating a system to regulate the drainage from the precipitated waters in the summer.Keywords: Morphometric analysis. Physiographic characterization. Geotechnologies.ANÁLISIS FISIOGRÁFICA DE LA CUENCA DEL RÍO MONAPO - PROVINCIA DE NAMPULA - MOZAMBIQUEResumen: El artículo presenta una caracterización fisiográfica de la cuenca del río Monapo, ubicada en la provincia de Nampula - Mozambique, con el objetivo de contribuir a la discusión sobre los sucesivos problemas del agua potable en la región. En cuanto a métodos y técnicas, cabe destacar el análisis empírico del área realizado en campo en noviembre de 2016, levantamiento fotográfico, análisis morfométrico y mapeo de la fisiografía utilizando geotecnologías. La cuenca drena un área de 8.047 km², atravesando el territorio de nueve distritos de Nampula (población estimada de 1.624.924 habitantes en 2015), en suelos cristalinos, representados en su mayoría por gneis y granitos. El clima presenta características semiáridas, caracterizándose como tropical seco con precipitaciones anuales entre 800 mm y 1000 mm. Los cultivos arbóreos y los bosques caducifolios con características de sabana, intercalados con cultivos de mango, marañón, mandioca, maíz, arroz y banano, dominan el paisaje. La morfometría de la cuenca indica un gran potencial de conservación de los recursos naturales, con baja susceptibilidad a la erosión e inundaciones y una mayor tendencia a la infiltración del agua. Los problemas de abastecimiento de agua en la provincia se deben más a las características de las lluvias, especialmente a la concentración de las lluvias de noviembre a marzo y al modelo de uso del suelo que a las características morfométricas de la cuenca. Es necesario adoptar acciones que favorezcan el almacenamiento y concentración de agua en reservorios artificiales, creando un sistema para regular el drenaje de las aguas precipitadas en el verano.Palabras clave: Análisis morfométrico. Caracterización fisiográfica. Geotecnologías.

2014 ◽  
Vol 65 (1) ◽  
pp. 100-110 ◽  
Author(s):  
Toshio Kumasaka ◽  
Takuo Hayashi ◽  
Keiko Mitani ◽  
Hideyuki Kataoka ◽  
Mika Kikkawa ◽  
...  

2018 ◽  
Vol 40 (8) ◽  
pp. 1101-1109 ◽  
Author(s):  
Abhishek Rajput ◽  
Savan K. Raj ◽  
Prem P. Sharma ◽  
Vikrant Yadav ◽  
Hitesh Sarvaia ◽  
...  

2019 ◽  
Vol 24 (3) ◽  
pp. 446-459 ◽  
Author(s):  
Charity O. Aremu ◽  
Omena B. Ojuederie ◽  
Folake Ayo-Vaughan ◽  
Olatunde Dahunsi ◽  
Aruna Olasekan Adekiya ◽  
...  

2013 ◽  
Vol 14 (1) ◽  
pp. 135-141 ◽  
Author(s):  
C. Santos ◽  
C. Matos ◽  
F. Taveira-Pinto

Greywater (GW) can be an important resource for urban water consumption, replacing potable water for purposes that do not require drinking water quality. If applied on a large scale, this practice will reduce the potable water demand and the wastewater produced in urban areas, minimizing the negative impacts and costs of water extraction and wastewater treatment. A correct characterization of GW is important to assess its potential for a direct reuse or, if not possible, to make a correct definition of a feasible and cost-effective treatment system. This article aims to contribute to the characterization of GW produced in washbasins and showers in domestic and public buildings. A compilation of several works on GW collection and sampling produced by the authors is presented. Samples were taken from GW produced in showers and washbasins in households, changing rooms and in a restaurant. Results are compared with values presented in similar studies and compared with standards and guidelines published in different countries.


2018 ◽  
Vol 45 ◽  
pp. 00078
Author(s):  
Grażyna Sakson

Rainwater harvesting is an alternative water supply method that has become popular in recent years around the world. This is mainly due to financial reasons (reducing the cost of potable water and fees for rainwater discharge to the sewerage), but also because of environmental awareness. In Poland, rainwater harvesting systems are not often used because of their low financial viability determined by high system construction costs and the low prices of potable water. Earlier analysis conducted by the author showed that the payback period of investment outlays was from a dozen or so years for large buildings, to a few dozen for single-family houses. This situation may change after the introduction of common fees for discharging rainwater from impervious areas into sewerage, and fees for the reduction of natural retention on newly built-up areas, in accordance with new water regulations. This paper presents a cost analysis of rainwater harvesting systems for ten cities in Poland, with varying annual rainfall depth and various pricing for potable water. Analyses were carried out for a single-family house located in an area equipped with a municipal sewer system, and for a large building, located in an area equipped and not equipped with a municipal sewer system.


2011 ◽  
Vol 32 (3) ◽  
pp. 385-397 ◽  
Author(s):  
Juan M. Pleguezuelos ◽  
Elisa Mora ◽  
Philip de Pous ◽  
Daniel Escoriza ◽  
Margarita Metallinou ◽  
...  

AbstractThe genetic variability and the potential distribution under past (Last Glacial Maximum; LGM (MIROC and CCSM simulations)) and present conditions were studied for the anguid Hyalosaurus koellikeri, using analyses of two mitochondrial (ND1 and ND2) and one nuclear (PRLR) gene and species distribution modelling (SDM) including 19 geographical coordinates, covering most of its distribution range. Unexpectedly, the genetic results show that H. koellikeri presents a very low level of variability both in the mitochondrial and nuclear genes studied. The present predicted distribution of H. koellikeri revealed a large potential distribution in both north and eastwards directions, with suitable areas predicted in places where the species has never been reported before, as for instance the Rif Mountains in Morocco, as well as into most parts of northern Algeria and Tunisia. The LGM distribution is even larger compared to the present, with a continuous predicted distribution from Morocco to Tunisia, and even into Libya under the MIROC simulation. The results of the genetic and SDM analyses suggest that the now isolated populations from Debdou and Tlemcen have probably been in contact during the LGM, but its absence from both present and past predicted suitable areas is still a mystery. Hyalosaurus koellikeri depends mainly on closed deciduous forests (typically Cedrus atlantica and Quercus sp.) and open deciduous shrubland with high amounts of annual rainfall. The results of this study and the absence of recent sightings of the species outside the core distribution might indicate a regression of the species. Hence, a reevaluation of the conservation status of the species seems warranted.


1993 ◽  
Vol 71 (9) ◽  
pp. 1816-1822 ◽  
Author(s):  
Philippe Grandcolas

The genus Therea Billberg, 1820 is redefined as a monophyletic taxon belonging to the group Ergaula + Eucorydia + Therea + Cryptocercus in the subfamily Polyphaginae Kirby, 1904. Three new species, T. regularis, T. defranceschii, and T. hyperguttata, are described as well as T. petiveriana (Linnaeus, 1758) and T. nuptialis (Gerstaecker, 1861). The known distribution of the genus in India extends from dry deciduous forests to more humid formations (between latitudes 19 and 10° N). The species live in areas with mean annual rainfall ranging from 500 to 3800 mm.


Author(s):  
Dr. Vasudev S. Salunke ◽  
Pramila. P. Zaware

Rainfall is one of the vital form of precipitation which affects not only agricultural activity but also entire ecology in any region. Hence rainfall distribution and its trends in district is important to understand water availability and to take decisions for the agricultural activities in area. This research paper is an effort to assess the spatial and temporal rainfall variability of Ahmednagar district of Maharashtra State. Ahmednagar is popularly known as the largest district of Maharashtra with fourteen Talukas. The average annual rainfall of this district is 621 mm with an average of 46 rainy days. In this study the spatial and temporal rainfall distribution of this district is taken in to account. Short-term annual rainfall data are considered from 1998 to 2014. The daily rainfalls of monsoon months of all the fourteen Taluka are analyzed for the year 2015.It was found that spatial and temporal variability is high in the District.


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