چكيده لاتين :
Introduction
Extrinsic and intrinsic sediment particle size showed changes in response to changes in geomorphologic and climatic conditions, showing the channel of the river is in dynamic equilibrium Morphs (Gupta, 2002). The factors include particle size grading tool for a better understanding of dynamic Earth processes Morphs engineering. Genus rocks, tectonic activity, including geological structure and climate are factors that result in the formation of river sediment load it is affected (Di Giulio et al, 2003; Vendenberghe, 2003). Sediment logical characteristics of many studies conducted within and outside the country, among which the following can be mentioned. Herami Mousavi et al (1380) investigated the changes in particle size and composition of the Mayan River (river bed and gravels with high slope) located in the South West of Mashhad, and the results showed that the grain size distribution in the upstream state and the weak Baymdal in addition to high-end fashion Baymdal downstream gravel, sand, a fashioned looms. Hrmy Mousavi et al (1382) investigated the relationship between contextual factors and the downstream sedimentary basin Radek, North West sycamore, and the results showed that all of the natural factors in pathological changes in the river system that are effective with small discontinuities in the river have caused respondents. Nakhaei et al (1383) investigated the factors Zvlachay sedimentary basins, and the results show that the increase in grain size along the river, resulting from lateral inlet and changes in the lithology. Javanbakht et al (1384) examining the gravelly bed of grain size in the dam basin through three distinct sedimentary found that are separated by two turns. Rabbani Far (1385) investigated the particle size of the sediment in the river bed Formed gravelly, and the results indicate that the two sedimentary discontinuity. Mao et al, 2009, compared to two small watersheds in Rio Korden and Maskardo have Italian Alps East. Their results showed that the volume of debris flow and bed load in the basin is very different from differences in the morphology of the basin fill in the dominant sediment source analysis, profiles, is studied longitudinal and curves slope.
Materials and Methods
study area
As defined by the Ramsar Convention on Wetlands include areas of marsh, ponds, marsh peat (peat land), blue, natural, artificial, permanent or temporary, with water still flowing, fresh, brackish or salty, including those of marine waters the water depth does not exceed 6 meters (Majnounian, 1377). According to the Ramsar Convention on Wetlands in 1355 as Wetlands International Parishan to be recognized and registered it (Ramsar convetnation secretariat, 2004). Parishan lake in the province of East KAZERUN Arjan is situated in a conservation area. (Comprehensive Wetland Management Plan Parishan - June 1389). The lake of the Zagros mountain range, at a distance of 15 kilometers southeast of the city Kazeroon and 125 km West of Shiraz (Fars province) between 51° ?25?^ʹ 25" and 51° ?43?^ʹ 50" longitude, and 29° ?22?^ʹ 25" and 29° ?27?^ʹ 40" latitude is located. Its height is 820 meters of free water. Basin area, about 41. 87 square kilometers of lake is estimated at an average depth of 2 - 2. 5 meters. The major water fountain pond from the north and northeast into which it enters, will be financed (Peasant, 1384). The region has a temperate climate with mild winters and hot, dry summers and warm, spring green and low durability. Based on the data from the nearest meteorological station, pond and surrounding 450 mm annual rainfall, mean annual temperature 22. 2 ° C and average annual evaporation of 2470 mm in meters (inclusive of Consulting Engineers, 1382).
Methods
In this paper, we investigate the distribution of the constituent grains of sediment has been disturbed lake. Therefore, 40 stations sampled at intervals of approximately 500 m to 1 km from each other along the coast and the center of the sediments were selected. The samples were then transferred to the laboratory, oven-dried using a shaker precipitates forming seed and grain diameter was obtained, after obtaining the frequency of particle diameter and particle deposition, the deposition curves in two ways: histograms and cumulative curves were drawn and the general shape of the deposits were interpreted. This study aims to estimate the aggregation status of lake in the coastal sediments of the central and benchmark samples of sediment were taken at 40 stations. Benchmark sample selection based on the sources of pollutants, their distribution, where the rivers join to the lagoon, the facilities and easy access to the site for sampling is performed. Standard methods were used for sampling Grap Van Vienna. Sampling was conducted in the second and third weeks of November 1392 and 400 g of each station sediment samples were collected from a depth of 15 cm. Samples at 120 ° C for 24 h were placed in the oven until completely dry. Metler scale using 200 g of each sample using eight sieve mesh numbers 20, 35, 45, 50, 60, 120, 230 on the top-down by the vibrator was placed for 10 minutes, then separating the filter from the shaker and the remaining sediment into the filter end of the weighing scales types were identified. Also very fine grains (less than 0. 063 mm) due to the large size of the grains in most samples were also analyzed. After obtaining the frequency of particle diameter and particle deposition, the deposition curves were plotted using the cumulative curve of the general shape of the deposits were interpreted and statistical calculations were performed using Excel 2013 software. Classification system for classifying sediments of America Department of Agriculture (USDA) was used.
Results
Distribution of the constituent grains of sediment sampling stations are not uniformly distributed in the average differences were observed at different stations. There is a different distribution of seeds in the soil sediments from different tissues in the basin and fountain at the entrance to the lagoon is at or near the sampling stations. In this table the weight distribution of the constituent grains of sediment sampling stations based on the percentage and distribution of the constituent grains of sediment sampling stations on the coasts of North, South, East and West in terms of the frequency and frequency graphs deposits each station were plotted on the frequency and the coefficient Phi.
Conclusions
Generally alluviums plain Kazeroon (Shahpur - Parishan) of soil cover on the sediment surface and rubble, sand and debris and fragments of calcareous silt and clay to a depth of 100 to 130 meters has been established. Morphology, not the flat prairie hills Gachsaran and Asmar and Bakhtiari Formation and river sediments and a staircase in the center of the plains can be seen. General slope of the plain alluviums Famour - distracted by the lake is Parishan. The range consists of alluvial fan deposits and alluvium and consists of grading the piece of rock, rubble and sand separately and away highlands are no cement, grain size changes and they are more fine (Eisaei, 1389).
In general, the sampling and measurement of the diameter of the grains forming the precipitate obtained after the gain and frequency of sediment particle diameter particle deposition curve and the curve of cumulative frequency curves were drawn using two methods and the public deposits were interpreted. The results indicate that these deposits had a uniform medium sand sediment type and tilt them towards Dath fine particles is very small, according to the results of classification and Agriculture Organization of America (USDA), the northern beaches of fine sand, fine and very fine sediment than in coarse sand, some stations in central and southern shores of sand, fine and very fine sand mostly in the western and eastern coasts of the sand distribution to a great extent more of the same kind of coarse sand and fine sand is then deposited on the whole, were named silty sand. The issue, according to the classification of America Department of Agriculture (USDA) designated study area was conducted. Given the cumulative frequency distribution of sediments at each station, the relative dependence between most stations were sampled. Solutions was determined that the adoption by the stations to the central coast stations over the lake of aggregation are almost completely different. Distribution of the constituent grains of sediment sampling stations are not uniformly distributed in the average differences were observed at different stations. The results also show that there is a different distribution of seeds in the soil in the catchment and river sediments from different tissues at or near the entrance to the lagoon is the sampling stations.
