The evolution of hydrographicbasin is the outcome of the interaction between the matter flow (present mainly in the rain quantity received by the hydrographicbasin area) and the energy condition (marked by the quantity of solar energy reaching the terrestrial surface). Tests carried out in previous years have shown that it is the precipitations that represents not only the main source of matter but the main factor in shaping the terrestrial surface. Current configuration of river network depends on many factors, such as: the altimetic position of the basin reported to the reference level; erosion resistance of constituent rocks; position of strata due to local tectonic evolution which has induced the current cofiguration of geological strata; random events, such as earthquakes, floods, deluges, vegetation covering degree; type of ground cover.
Very low environmental vulnerability: this class is distributed in the extreme south of the hydrographicbasin, the environmental attributes that define this classification are the soils originating from the Corumbataí Formation, with thicknesses that vary below 2m and can reach up to 5m. Geology is composed of variegated shales. The very low vulnerability is also found in the central region of the basin with soils from Basic Tabular Intrusives, which are characteristic of clayey texture. In addition, it is a shallow soil with a thickness that can reach up to 2m. The slope present in these regions ranges from < 6% to 20%.
ABSTRACT. Seasonal average flow in Râul Negru hydrographicbasin. The Râul Negru hydrographicbasin is a well individualised physical-geographical unit inside the Braşov Depression. The flow is controlled by six hydrometric stations placed on the main river and on two important tributaries. The data base for seasonal flow analysis contains the discharges from 1950-2012. The results of data analysis show that there significant space-time differences between multiannual seasonal averages. Some interesting conclusions can be obtained by comparing abundant and scarce periods. Flow analysis was made using seasonal charts Q = f(T). The similarities come from the basin’s relative homogeneity, and the differences from flow’s evolution and trend. Flow variation is analysed using variation coefficient. In some cases appear significant Cv values differences. Also, Cv values trends are analysed according to basins’ average altitude.
ABSTRACT: The edafoclimatic conditions of the Brazilian semiarid region favor the water loss by surface runoff. The state of Ceará, almost completely covered by semiarid, has developed public policies for the construction of dams in order to attend the varied water demand. Several hydrological models were developed to support decisive processes in the complex management of reservoirs. This study aimed to establish a methodology for obtaining a georeferenced database suitable for use as input data in hydrological modeling in the semiarid of Ceará. It was used images of Landsat satellite and SRTM Mission, and soil maps of the state of Ceará. The Landsat images allowed the determination of the land cover and the SRTM Mission images, the automatic delineation of hydrographic basins. The soil type was obtained through the soil map. The database was obtained for Jaguaribe River hydrographicbasin, in the state of Ceará, and is applicable to hydrological modeling based on the Curve Number method for estimating the surface runoff.
Correct identification of significant or insignificant uses becomes fundamental in the process of charging for water use because the uses that are considered insignificant are not charged. In accordance with ANA et al. (2004), the exemption of payment for water use derives from the stipulation of insignificant use as per Law No. 9,433 of 1997, stating that it must previously be proposed by the committee of the hydrographicbasin for approval by the Board of Water Resources, after negotiations with users, the public authorities and the representatives of civil society.
Râul Negru collects its tributaries from the eastern sector of Braşov Depression and from its mountainous slopes: Bodoc, Nemira, Vrancea and Întorsurii Mountains. The hydrographicbasin presents two representative, almost equal relief levels. The mountainous margin has relatively steep slopes and well developed piedmonts. The alluvial compartment from the depression has an almost horizontal relief.
Geotechnical maps of suitability for urbanization can provide directives for land use in terms of susceptibility to disasters. This paper presents methodological innovations for the development of these maps by incorporating hydrographicbasin analysis in a case study conducted in the municipality of Itapevi. The Shalstab (Shallow Slope Stability) model evaluated the susceptibility of an area to landslides and correlated events. Wet zones were mapped by combining the Hand (Height to the Nearest Drainage) model with floodplain mapping and proximity to concave slopes. Participatory mapping delineated critical flood areas and possible impacts of land use on sub-basins. Urbanization trends were modeled using multivariate kernel analysis. This study presents perspectives on disaster risk management integrated with those of basin management.
The study of solid discharge of a hydrographicbasin is important for making correct decisions regarding planning the management of water resources. The objective of the present study was to determine key planning curves that represented loads of suspended sediment in the River Piranhas. The study was carried out in the hydrographic sub-basin of Piranhas River. A total of 15 campaigns of hydrosedimentometric measurements was performed, in the period from November 2012 to May 2013, including the measurements of suspended sediment concentration and liquid and solid discharges. Key curves were plotted for sediment in suspension, for the dry and rainy periods, which presented good coefficients of determination.
It is important to highlight the relevance of this article to the scientific community and society, since relatively few studies were conducted on the subject. The conservation of water resources demands a favorable economic situation of the institutions that use these public policies, since the recovery of degraded areas have a high cost, even with great results for the environment. The success of conservation areas of the hydrographicbasin as result of perform Water Producer Project was not evaluated in Brazil. From this analysis it will be possible to improve PA performance, as well as the use of financial resources for its maintenance.
Abstract: Studies that organize lists of species are essential and act as the starting point for future discussions on the ecology of fish in environments that are poorly studied. The present paper describes the fish assemblage of the hydrographicbasin of Chasqueiro Stream, an important component of the Mirim Lagoon system. Fish were collected during one year period between August/2012 and July/2013 in six sites, comprising three biotopes: upstream, reservoir and downstream. A total of 22,853 specimens were collected, and were distributed into 83 species, 20 families, and eight orders. The two species with the largest number of individuals captured were Bryconamericus iheringii with 2,904 (12.71%) and Cheirodon ibicuiensis with 2,868 (12.55%). Characiformes and Siluriformes were the most representative orders in terms of richness and abundance. Bryconamericus iheringi and Cyanocharax alburnus were the species with the highest abundance upstream, while Hyphessobrycon luetkenii and Corydoras paleatus contributed more to the abundance downstream. Cheirodon ibicuhiensis and Heterocheirodon jacuhiensis were the most representa- tive species in the reservoir. This study revealed a rich fauna of fish, which should be preserved for future generations and for the maintenance of local and regional biodiversity.
ABSTRACT. Abundance and distribution of Aeglidae (Crustacea: Anomura) in function of land use in Rio Jacutinga hydrographicbasin, Rio Grande do Sul, Brazil. This study investigated the influence of land use and occupation on the density and distribution of aeglids in the hydrographicbasin of the Jacutinga river (northern state of Rio Grande do Sul, Brazil). Sampling was carried out during the summer and winter of 2004, at 12 sites distributed in river spring, agriculture, grazing, and urban areas. Animals were collected using a Surber sampler. An analysis of variance (ANOVA) was conducted to evaluate differences in the density of species in each land use and sampling period. Biological data were classified using cluster analysis (Euclidian distance; UPGMA). A total of 226 aeglids were captured, including 167 (78.89%) specimens of Aegla platensis Schmitt, 1942 and 59 (26.11%) specimens of A. singularis Ringuelett, 1948. The aeglid distribution was associated with land use and occupation. In river spring and grazing areas, A. platensis was predominant, whereas in urban and agricultural areas A. singularis was the most prevalent species.
Research related to urban and hydrological landscapes collaborates with the understanding of natural landscapes through their connections and relationships with the natural environment, contributing to the strengthening of actions aimed at the maintenance of natural, urban, and water ecosystems in the planning actions. This work aims to analyze the interactions between road, hydrological and structural landscape connectivity present in the Tietê-Jacaré HydrographicBasin - SP, through the application of the Landscape Integration and Connectivity indices, to evaluate the dynamic process of interactions between the landscape compartments in 2007 and 2017. The information was analyzed using Geographic Information Systems, relating the interference and correlations of the road and hydrological space with natural areas on a temporal scale. Considering the 10-year interval, there was an expansion of agricultural activities with a cultivated area increase of 24,507.53ha and vegetation loss of 32,149ha. The hydrographicbasin has reduced drainage areas and increased the number of roads that eventually led to changes in connectivity and fragmentation patterns, where urban areas and sugarcane are dominant in these interconnections. This predominance should be observed in more detail regarding the planning of the watershed, especially related to the possible impacts caused by them, where the Landscape Integration and Connectivity indices were presented as essential tools in the diagnosis focused on the conservation of ecosystems.
Situated in the northern part of the country, the Suceava river basin has a surface of 2612 km 2 , from which 13% (340 km 2 ) spreads on the territory of the Ukraine, reaching 47° 58' N. Inside this basin appear two major relief units with distinct characteristics (mountainous and plateau), which are separated by a contact area represented by a piedmont sector and a depression series (Solca, Cacica, etc.).
ABSTRACT: The quantitative knowledge of hydrological parameters (rainfall and flow) and their spatial and temporal variability on the regions or basins should be understood as essential to the efficient planning and management of water resources. Because the Ivinhema Basin, located in the state of Mato Grosso do Sul, Brazil, represents an important inductor on the region agricultural development, characterized as a major producer of grains and meat, it was used to characterize the hydrological study. Knowing the rainfall, flow and drainage area of each of the studied affluent, it was calculated the proportion of contribution of the affluent. To that end, it was proposed the concepts of potential and real contributions, aiming to identify the proportion of contribution of each of the affluent to the formation of the flow in the Ivinhema Basin. The results revealed that: the highest rainfall in the Ivinhema Basin occurred in the headwater regions; the mean specific flow of long duration reduces from the headwater to the mouth of Ivinhema Basin; the Sub-basin of Dorado’s River has the highest potential and real contribution for the formation of the Ivinhema Basin flow; and the drainage areas of the affluent Dourados and Vacaria contribute with 53% flow of the basin.
Brazil is the largest producer and consumer of passion fruit in the world. Fruticulture is a prominent segment of Brazilian agriculture. Despite recent technological and scientific advances, the climate is among the most important variable in crops productions. In this context, agroclimatic zoning should be one of the first information to consider before starting the cultivation of a particular crop. The purpose of this paper was to perform agroclimatic risk zoning for passion fruit (Passiflora edulis Sims) in the basin of Parana river 3, located in Parana state, South of Brazil. For this we used meteorological data from 43 stations with historical series between from 1976 to 2019. The analysis of agroclimatic risk was based on the species requirements, such as rainfall, annual water deficit, annual average temperature, sunshine and the risk of frost. The occurrence of frost was the most limiting factor for production in the region. This meteorological factor restricted planting in the central-eastern portion of the basin. In other areas, the risk is present, however the suitability for the passion fruit planting was guaranteed.
It is understood that the knowledge of the distribution of maximum events on a watershed of the Piquiri river and the influences exerted by climatic changes are of fundamental importance for the planning of use and occupation of the region. This paper aims to analyze the spatial distribution of maximum precipitation events over an area of the Piquiri river basin, based on the rainfall forecasts of the regional ETA model and historical data. For this purpose, thematic maps were prepared using the ordinary management method, the distribution of the pre- established maximum heights, with duration of 24 hours, reflection periods of 2, 5 and 25 years, for members 2 and 4 of the model ETA In the period from 2010 to 2100 and for data recorded by rainfall stations from 1980 to 2010. In this way, it was observed that a tendency of spatial distribution of maximum precipitation events for the future to maintain a current behavior, Predominating maximum and more intense precipitations in the part of the precipitation and less intense maximum precipitations in the north part.
the municipalities that compound the basin. The results showed that the greatest water user grant has industrial purpose, with underground extraction massively than the superficial, where the palm oil industry has the highest water use grant. Only a small number of inhabitants are served by water distribution and there are high rates of loss in the distribution system. The Alto Moju sub-basin suffers high pressure on its natural resources. We noticed that the basin as a whole has most of its territory covered by forest, although pasture and secondary vegetation are also expressive. In general, we observed that the biggest challenge is to align the management of water resources and efficient land use.