---

  The use of SPOT and Landsat satellite images as combination with field test presents a very useful information on the identification of alluvial fans and their geometry. Existence of very typical alluvial fans belongs to the Plio-Quaternary on the Binalud mountain brow is a very interesting environmental laboratory in which these relationships can be studied and analyzed. This study is done by experimental and laboratory method based on fielddata analysis and interpretation of satellite images. So that identification of fans were done through SPOT and Landsat satellite images along with control of the 1/4000 aerial images of Binalud blocks. For clarification of alluvial fans boundary, ground control operations was carried out in order to their Geomorphometry results have less error. The main purpose of this research is to identify the geomorphometryan quantitative relationships of south Binalud's alluvial fans through reconciliation of round prospectand field observations. Comparison of SPOT and Landsat satellite images in identification of 20 large and small alluvial fans of southern Binaloud mountains forehead revealed that SPOT resolution strength and accuracy of images in geometric reviewing of alluvial fans is higher than Landsat but Landsat satellite images is more applicable in identification of large-scale forms of alluvial fans surfaces.

---

The plane surfaces are from stagnant waters like wetlands, lake or pond which are specified with the height points in topographic maps. The extent of these surfaces are suddenly interrupted by tracing of the river networks and are symbolic in the shape of little two-directed rivers. Accordingly the most extend of Maharlu lake was reconstructed in Quaternary (1190.3 km2). The estimated area was 5 times than current condition which is unlikely to this area in accordance with the area of basin (4281). Climatology conditions of the basin was reconstructed and the oscillation of the lake surface was scrutinized and reconstructed to test of hydro geomorphologic conditions. So that the inner and outer climatic stations of the basin and monthly temperature and precipitation were selected. It was correlated between monthly/annual temperature and precipitation as dependent variables, with height as an independent variable then monthly/annual isohyet and isotherm maps draw by the use of evaluated relations and height layer of the basin. Monthly weight temperature and precipitation of basin, was calculated and correlated between monthly oscillations of basin with them by replacing the weight height in current equations. The equilibrium line of water and drought was rebuilt in Quaternary periods which the temperatures were 5, 8 and 12˚C less than current condition. The annual area, volume, depth, evaporation and runoff coefficient of the lake was estimated by evaluation of the volume of precipitation. The results showed that even with the decrease of quaternary temperature (12˚C), the lake didn’t have the permit of extraction more than 300 km. The most extent of the conditions reflected from hydro geomorphology could be related to the limestone effect in positive balance of water or the existence of more ponds than current conditions

---

Abstract
The nature of most of the external forms and processes of the earth depends on the climatic conditions prevailing over a region over time. Therefore, by studying the geomorphology of various environmental phenomena, it is possible to reconstruct the past climatic conditions. The purpose of this study was to identify the geomorphologic evidence of quaternary climate changes in Meyghan playa. To this end, the required information layers were prepared, or satellite images from IRS and ETM were extracted, and the Meyghan basin's geomorphology map was drawn up based on them. Then, the ancient Meyghan playground was reconstructed by analyzing four glacial, climatic, human and laboratory indicators on 11 sedimentary samples, the results of which illustrated the role of wind and water processes in sediment transport. Also, an elevation of 2400 meters was considered a good place for the formation of glacial circuses. In general, one can claim that the climatic conditions governing beige are in the Quaternary wet periods; most of the present sediments of the playa belong to volcanic rocks and shale margins of the basin. Also, due to the poor selection of samples, the waves did not have much activity in most of the courses, and sediments were formed in a slow melting environment.The existence of mineral Elite in most sedimentary samples indicates the much larger dimensions of the lake in the past, and lower amounts of hematite in some specimens indicate the deposition of sediments from the water, the evolution of the climate towards the present warm and dry conditions, and the conditions for the oxidation of sediments during Time is up.
Keywords: climatology change, geomorphological evidence, Meyghan playa, quaternary
Introduction
Playas from the past century have been of interest to geographers and geologists. The role of playas as a valuable evidence of climate change has been the main focus of this study. The aim of this study was to identify the geomorphologic evidence of quaternary climate change in Meyghan play. For this purpose, the necessary information layers were prepared, or from satellite images P6 IRS (with spatial resolution of 24 meters) were extracted and the geomorphology map of Meyghan basin was drawn based on them. Then the Meyghan playground was reconstructed in humid quaternary periods with the assistance of four glacial, climatic, human and laboratory indicators.The Meyghan sedimentary basin is 5528 square kilometers. Meyghan playa has 135 square kilometers area and is located at an average height of 1675 meters above sea level and at altitudes of Alborz and Zagros, 15 kilometers north and northeast of Arak city.
Materials & Methods
In order to do this study, four glacial, climatic, and human and laboratory indicators were used as evidence assessment of wetter periods in Meyghan play. Then each of the indicators was identified and analyzed separately in Meyghan playa.

1. Glacial Indices: For analysis of glacier indicators, digital elevation model, topographic map 1: 25000, satellite imagery IRS P6 and regional temperature map were collected. Then, by examining the shape of the curves of degree and conformance and their relationship with zero-degree line and satellite images, the circus placement was extracted from topographic map.
2. Climate indexes: Regression relationship was established for calculating climatic indices, average temperature parameters and annual precipitation of 8 climatic stations in a 25-year long period. From 1987 to 2012, the regression relationship was established and its equations applied on the digital elevation model of the area.
3. Human Indicators: A review of human indicators through observation of the field and exploration of the studied area, or strategies such as testing on the evidence available in the playa environment to prove human life in playas in the distant period, is a strategic one.
4. Laboratory Indices: For laboratory studies, data from 11 trenches we collected from the study area was used. In the first stage, field and survey operations were sampled in the study area. In each of the trench points, a trench was drilled to a depth of 75 cm with a small chisel and a shovel, which resulted in the removal of 11 samples of sediment from different locations with proper dispersion. Samples were taken in plastic and carefully labeled. Photos were then taken from the sedimentary environment of the samples. The laboratory parameters in this study included Granulometeric analyze, orthoscopic interpretation, and XRD and XRF tests.

 
Discussion of Results & Conclusions
According to the Granulometry results of samples, calculating the chromobin index showed that samples 5, 6 and 7 were of river sediments and other samples were low sediment deposits. Most of the specimens also tended to fine-grained particles. According to the analyzes, the present sediments of the present day are greater than the second and third Shale, containing chlorite and Elite minerals, as well as volcanic rocks (belonging to the Pliocene period) of the basin, and, of course, with moderate sedimentary maturity. The average temperature of the area during the quaternary period varied from a maximum of 2.67 to a minimum of -6.6 ° C. The results of morphoscopic analysis showed that in the transport of sediments to beech groves, in addition to the wind process, the blue process also played a significant role. Cumulative curves drawn on the basis of granulometric studies were also characterized by broken straight lines indicating that various mechanisms caused the sedimentation in the studied area. The analysis of the oxides of the main and secondary elements of the area showed; the origin of the deposits of the sediments of the area were of igneous rocks. From other points in the morphoscopy of sediments, it is found that kaolinite is found in the area of the plain, which goes underwater, and is much less visible on the margin of the playa, which proves the formation of kaolinite in the playground in Playa. Slowly Angularity of almost all quartz particles is evident in all samples, indicating the physical destruction of quartz during transportation to the desert and, of course, should not ignore the relative resistance of more quartz minerals.