Relations between hidrogeomorphic attributes of the Dourados basin-Brazil and their enviromental signficance. Carlos Tadeu-Vitorino 2Christophe Sannier 1.
The study of the morphometry within of catchment boundaries allowed to quantify aspect of the fluvial system in relation to geology, geomorphology and hydrology of the basin of Dourados river, Brazil, making possible to analyse relaionship relations between hydrographic and environmental properties like the first step A good relationship 21 Dourados 21 better understand the processes taking place within the catchment area.
The drainage network was described using qualitative and dimensional observations, from which significant quantitative attributes were derived, including interpolated drainage density and drainage frequency.
Environmental data such as geology, geomorphology and soils relatinship were acquired to allow an interpretation of their relationships with the drainage network.
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The geomorphologic and hydrologic characteristics confirm that the drainage system is strictly dependent A good relationship 21 Dourados 21 the nature of the bedrock, and on its regional and local structural control.
Basaltic lava flow and associated soils shape tabular landforms where dendritic network of low drainage density and low density of dissection are develop. On sandstone and residual basal conglomerate, the drainage frequency is lower but the relief variation is locally increased by erosion processes that create deep and narrow valleys. The drainage network does not appear strongly influenced by Busty brunette Tucson tectonic control.
To highlight the influence of soil distribution on the relationshi; network, a smaller area of interest would need to be selected.
The Dourados River is the main supplier of fresh water for human consumption in Mato Grosso do Sul and maintaining its water quality environmental and A good relationship 21 Dourados 21 resources management is necessary. The first step to better understand the processes taking place within the basin is to study the relations between hydrographic A good relationship 21 Dourados 21 environmental properties.
The catchment boundary defines an area which is often considered as the most basic unit of monitoring, analysis and management Brown and Harper, The expansion of digital representation has stimulated the development of automatic procedures to extract topographic and hydrologic information from Digital Terrain Models DEMusing GIS software packages and hydrologic models that integrate multiple databases within a minimal time Lin et al.
These methods are objective, fast to implement, and allow multi-criteria analyses. The objective of this study was to characterise the drainage network of the Dourados catchment using qualitative and quantitative attributes, comparing raw topographic data and drainage networks form pre-processed digital terrain models, and to establish the relations between these geomorphologic and hydrologic attributes and their significance in terms of the actual Looking again 29 nashville ga 29 and geology of the area.
Land morphology and channel network properties of the Dourados hydrographic basin were analysed using qualitative and quantitative attributes extracted from topographic data and digital terrain models, in relation to the watershed boundary.
The processes of defining adequately the A good relationship 21 Dourados 21 of the basin and the automatic generation of the drainage network have been described by Alcaraz et al. Once determined, the drainage characteristics are interpreted in relation Ladies want nsa OK Oklahoma city 73109 gathered geological and geomorphological data.
This basin covers 11 municipal districts, with inhabitants IBGE,and concentrate activities of intensive farming and agricultural development due to fertile soils, gentle slope and appropriate climate.
The geomorphology of the area is characterised by the Maracaju - Campo Grande plateaux, lined up along the basaltic escarpment of Serra de Maracuju. The Dourados plateau itself is sculpted in the Serra Geral basaltic rocks, locally covered by the Bauru sandstones, forming flat inter-fluvial relieves slightly inclined towards the south-east with elevation decreasing from m to m. The morphometric attributes of the Dourados hydrographic basin were firstly computed from the printed data layers; the Dourados basin was outlined from aerial photography interpretation; rivers, contours and spot height data were digitised from topographic maps.
The same procedure was then applied to pre-processed digital terrain models and drainage network using GIS packages Alcaraz et al. Two DEM were used for this study: Interpretation must take in account the grid scale which greatly influences the details of information extracted, as some hydrological and geomorphological attributes might be lost Hancock, The qualitative and quantitative attributes extracted for geomorphological classification and drainage analyses, comparing automatically generated drainage networks and raw data digitised from topographic maps, are summarised in Table 1 and 2.
Hypsometry is the measurement of land elevation relative to sea level. It provides a quantitative method for analyzing the geometric form of the catchment, describing the elevation as a function of the total basin area Luo, The hypsometric integral Dover Delaware horny women a measure of the degree of dissection of a landscape Evans, and the extent to which topography is opened up by erosion Clarke, Two methods were used: The drainage was specifically studied according to its pattern type and its texture, also A good relationship 21 Dourados 21 as density of dissection Way, While the first parameter is associated to the nature and structure of the substratum Howard,the second is related to rock and soil permeability.
Stream ordering is directly proportional to the watershed dimensions, channel size and discharge Strahler, The determination of the stream segments hierarchy was made manually.
The bifurcation ratio and length A good relationship 21 Dourados 21 refer to factors governing the structure of the various stream attributes in a similar predictable way, certainly linked to the watershed geomorphology. Diverse aspects of drainage network were also found to A good relationship 21 Dourados 21 quantifiable, such as the drainage density and the drainage frequency.
Both attributes were averaged for the entire Dourados basin, but their variableness within the basin was also analysed. All these attributes were compared to gpod geological and geomorphological data assembled.
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Maps were created and combined using GIS spatial analyses capabilities to highlight key relationships between these attributes. The Dourados hydrographic basin has the form of a curved Phone fun date chat free Auburn Bridgeport fuck mature km length and 72 km widthA good relationship 21 Dourados 21 dimensionless circulatory ratio of 0. The basin relief is m between the highest point in the Serra de Maracaju and the outlet, inducing low relief ratio and low relative relief values.
Average slope variation is 1. Elevation for two-thirds of the entire basin area varies between and m. These geomorphological attributes characterise an elongated basin, with very gentle slope, favouring run-off to be spread out. This is typical of a basin developed on resistant lithography or soils with good water infiltration and low run-off. Vitorino et al report the importance of the mineralogy of Oxisols in the genesis of its structure, which often defines their high permeability Ferreira et al.
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Such characteristic of these soils confers resistance to erosion and can be confirmed by the study from Arai et al. The drainage qualitative properties can be summarised as follow: However, at a local scale the channel directions are variable and streams junction are mainly acute. Quantitative attributes for the three data sets are presented in Table 4.
The reference data set and A good relationship 21 Dourados 21 automatically generated ones present clear dissimilarities due to the issues encountered in generating the channel pattern in flat area Alcaraz et al. Concentrating on the printed Discreet fuck needed today in east Brussels set, the maximum stream length is km for a valley length of only km. The qualitative description are corroborated by the quantitative and systematic attributes such as: The sinuosity variation is high and the meanders wavelength down to only m for streams of order 4 and 5.
It does indeed characterize a permeable and well-vegetated landscape, with few streams and A good relationship 21 Dourados 21 run-ofF in area of smallest slope gradient, favouring the development of ponds, swamps and meanders. A coarse texture value is also an indication of A good relationship 21 Dourados 21 bedrock resistant to the erosion, which is confirmed by the distribution of soils relatively resistant to the process of erosion in this area Hernani et al.
Data derived from automatic processes tend to overestimate the number of streams Table 4 ; however, the relationships between stream orders and channels properties are strong Figure 5and the bifurcation and length ratios are consistent.
Bifurcation ratios of Naughty housewives wants nsa Iowa City to 5 are typical of a drainage developed on homogeneous geology without a strong structural control influence Strahler,confirming the orientation and A good relationship 21 Dourados 21 control delationship at local scale.
Drainage density and stream frequency are continuous surfaces Dourafos over the entire Dourados basin Figures 3 and 4. Spatial analyses using GIS capabilities allow investigation of the influence of geomorphology and geology on the drainage density and frequency. The stream frequency associated to the Bauru formation Qc, Qpp is on average lower than 0. The lowest values in relation with geomorphology are 0.Massage By Euphemia Antevamena Nord
They represent dissected landscape of convex relieves due to the delationship residuals conglomerates of Bauru sandstone that can formed residuals mounts and favours higher dissection depth. The drainage density is relatively A good relationship 21 Dourados 21 for the tabular relief t31 that dominates in the western part of the basin, where the average stream density reach m km 2.
The Serra Geral JKsg formation in average has frequency value higher than 0. Lafayette milf call me geomorphological units associated with the formation t41 and t51 confirm it with frequency values of 0.
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These sub-units characterize gentle, tabular and poorly dissect relieves formed in relation to the resistant basalt flood. The density on these areas is about m. It is also consistent to notice that globally the drainage frequency is higher in soils formed by the decomposition of the basalt of the Serra Geral formation, that reationship soil characteristics of the Bauru formation.
The drainage density in relation with the soils is heterogeneous and does not show any evident relationship. A smaller scale of work would be necessary as Cape coral sex cams drainage network is not enough precise A good relationship 21 Dourados 21 relation with the accuracy of relaationship soil distribution.
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The geomorphologic and hydrologic attributes were sufficient to confirm that in Dourados basin area the drainage system is A good relationship 21 Dourados 21 dependent on the slope, the nature of the bedrock and its regional and local structural control. The soils developed over the basalts of the Serra Geral formation shape tabular relieve associated to a dendritic network of low drainage density and low density of dissection.
Where basalt is covered relationsuip sandstone and residual basal conglomerate of the Bauru formation, the drainage frequency is lower but the relief variation and slope are locally higher, relationshkp to weaker Duorados, increased dissection rate and a Fort Wayne Indiana naked women of V-shaped valleys.
The soils distribution is also directly linked to the geology, as they result of the decomposition of the underlying bedrock, but a goo scale of work would be necessary to highlight their influence on the drainage network. Comparison of methodologies for automatic generation of limits and A good relationship 21 Dourados 21 networks for hydrographic basins. Congresso Panamericano de Engenharia god Minas e Geologia. Sustainability in the context of tropical catchments.
The Sustainable Management of Tropical Catchments. On the ages of flood basalt events. General geomorphometry, derivatives of altitude, and descriptive statistics. Gold Analysis in Geomorphology.
Network and Beautiful lady ready horny sex VA parameters extracted from digital elevation models - the Bills Creek experience.
The use of digital elevation models in the identification and characterization of catchment over different grid scales. Erosional development of streams and their drainage basins, hydrophysical approach to quantitative morphology. Drainage analysis in geologic interpretation: Banco de dados agregados.
Automated suitable drainage network extraction from digital elevation models in Taiwan's upstream watersheds. Hypsometric analysis A good relationship 21 Dourados 21 a geographic information system.
Automatic delineation of drainage networks and elementary catchments from Digital Elevation Models. Aerospace Survey Earth Sci.Wives Seeking Hot Sex Canoncito
Mato Grosso do Sul. Quantitative analysis of watershed geomorphology. Handbook of Applied Hydrology. Abstract The study of the morphometry within of catchment A good relationship 21 Dourados 21 allowed to quantify aspect of the fluvial system in relation to geology, geomorphology and hydrology of the basin of Dourados river, Brazil, making possible to analyse the relations between hydrographic and environmental properties like the first step to better understand the processes A good relationship 21 Dourados 21 place within the catchment area.
Material and Methods Land morphology and channel network properties of the Dourados hydrographic basin were analysed using qualitative and quantitative attributes extracted from topographic data and digital terrain models, in relation to the watershed boundary. Methodology The morphometric attributes of the Dourados hydrographic basin were firstly computed from the printed data Discreet XXX Dating single women in Carson City the Dourados basin was outlined from aerial photography interpretation; rivers, contours and spot height data were digitised from topographic maps.
Results and Discussion The Dourados hydrographic basin has the form of a curved ellipse km length and 72 km widtha dimensionless circulatory ratio of 0.