Ardak Watershed with an area of about 497 km<sup>2</sup> is one of the tributaries of Kashaf Rud River Watershed in north east Iran,which consists of two main rivers.This catchment is located in the Kopet-...Ardak Watershed with an area of about 497 km<sup>2</sup> is one of the tributaries of Kashaf Rud River Watershed in north east Iran,which consists of two main rivers.This catchment is located in the Kopet-Dagh structural zone and Ardak Watershed is surrounded by Chaman Bid, Mozduran,Shurijeh,Tirgan,and Sarcheshme Formations.The lithofacies and architectural elements show that two main rivers are gravel-bed braided river in their most parts.The major erosion types in this watershed are rock fall,rill,surface erosions,and gully and channel bank erosion.In the study area,the amount of sediment yield estimation in GIS framework using MPSIAC model is about 130.749 m<sup>3</sup>·km<sup>-2</sup>·a<sup>-1</sup>or 1.77 t·h（-1）and most parts of the basin（more than 90%）has low erosional rate.Mozduran and Tirgan Formations展开更多
Based on the basic principles of BP artificial neural network model and the fundamental law of water and sediment yield in a river basin, a BP neural network model is developed by using observed data, with rainfall co...Based on the basic principles of BP artificial neural network model and the fundamental law of water and sediment yield in a river basin, a BP neural network model is developed by using observed data, with rainfall conditions serving as affecting factors. The model has satisfactory performance of learning and generalization and can be also used to assess the influence of human activities on water and sediment yield in a river basin. The model is applied to compute the runoff and sediment transmission at Xingshan, Bixi and Shunlixia stations. Comparison between the results from the model and the observed data shows that the model is basically reasonable and reliable.展开更多
文摘Ardak Watershed with an area of about 497 km<sup>2</sup> is one of the tributaries of Kashaf Rud River Watershed in north east Iran,which consists of two main rivers.This catchment is located in the Kopet-Dagh structural zone and Ardak Watershed is surrounded by Chaman Bid, Mozduran,Shurijeh,Tirgan,and Sarcheshme Formations.The lithofacies and architectural elements show that two main rivers are gravel-bed braided river in their most parts.The major erosion types in this watershed are rock fall,rill,surface erosions,and gully and channel bank erosion.In the study area,the amount of sediment yield estimation in GIS framework using MPSIAC model is about 130.749 m<sup>3</sup>·km<sup>-2</sup>·a<sup>-1</sup>or 1.77 t·h（-1）and most parts of the basin（more than 90%）has low erosional rate.Mozduran and Tirgan Formations
文摘Based on the basic principles of BP artificial neural network model and the fundamental law of water and sediment yield in a river basin, a BP neural network model is developed by using observed data, with rainfall conditions serving as affecting factors. The model has satisfactory performance of learning and generalization and can be also used to assess the influence of human activities on water and sediment yield in a river basin. The model is applied to compute the runoff and sediment transmission at Xingshan, Bixi and Shunlixia stations. Comparison between the results from the model and the observed data shows that the model is basically reasonable and reliable.
