بررسی تغییرات حوضه آبریز رودخانه خیاوچای برمبنای مقادیر فرسایش و رسوب با تاکید بر تغییرات کاربری اراضی
/حدیثه قاسم زاده احمداباد
: برنامه ریزی و علوم محیطی
، ۱۳۹۶
، راشدی
چاپی
کارشناسی ارشد
ژئومورفولوژی(گرایش هیدروژئومورفولوژی)
۱۳۹۶/۱۱/۰۸
تبریز
جریانهای رودخانهای همواره تحت تاثیر فرسایش و حمل رسوب میباشند که در پروژههای هیدرولوژی رودخانهها نقش تعیین کنندهای دارند .انسان برای ادامه حیات خود به موادغذایی نیاز دارد که در اثر وجود آب و خاک بدست میآید.عاملی که وجود آب و خاک را به خطر میاندازد فرسایش است که همواره برای از بین بردن آنها عمل میکند .به همین جهت است که مبارزه با فرسایش در سطح جهان مورد توجه قرار گرفته است
River flows are always affected by erosion and sediment transport, which plays a decisive role in hydrological projects of rivers. To survive, humans need food that comes from the presence of water and soil. The factor that threatens the presence of water and soil is the erosion that always works to eliminate them. That is why the fight against erosion has been taken into account worldwide. The catchment area of Khiyav Chay is located in northwest of Iran and in the west of Ardebil province, south of Meshgin Shahr city and northwest of Sabalan volcanic mass. The total area of the basin is 139.47 km2. The purpose of this research was to investigate the ghosting potential of the studied basin, to investigate the changes in the NDVI vegetation index and estimate the erosion and sediment yields and the following results were obtained.The results of climate indices such as Ws (fluctuation of moisture in formations) and hydrothermal coefficient indicate that the study area has a good potential for dredging.Vegetation index of NDVI with total precipitation of the basin in the 17-year period showed that the basin vegetation is in line with precipitation. The SWAT model can be used in runoff and sediment estimation. The input data of the model can be divided into two general point and spatial categories: point data including statistics and information on meteorological and hydrometric stations, and spatial information including digital elevation layers (DEM) , Land use layers and soil layers. After SWAT model was used for calibration of the model, SWAT CUP software and SUFI-2 software were used. In sum, the R2, r-factor and p-factor variables. However, in some cases, the Nash Sutcliff coefficient is NS that is reported in Swat model studies. This can be due to the erore of the measurement of the hydrometric station, the lack of accuracy and the inaccuracy in the data at the sedimentation data at the hydrometric station and the complexity of the process measurement precipitate