In this paper , gravel characteristics and variety along the river were studied with digital image technology ; variety of grain sizes distribution of the river bed along jinmahe section in minjian river was analyzed ; several representative formulas of bedload transport rate were proved according to the field data of dujiangyan 本文采用数字图象技术研究了卵石颗粒的几何特征及沿程变化;分析了岷江金马河河段河床质级配的沿程变化;根据都江堰的输沙率资料论证了几家有代表性的推移质输沙率公式的实用性。
Eco - environment geology system is complicated and its quality has some uncertainty to people ' s acquaintance . so based on the principles of fuzzy mathematics and using exact fuzzy comprehensive evaluation and grey correlative fuzzy evaluation , the quality of eco - environment geology in the upper reaches of minjiang river is assessed in this paper 由于生态环境地质系统的复杂性,且质量的好坏在人们的认识上具有一定的不确切性,因此,本文根据模糊数学的原理,采用确定型模糊综合评判方法、灰色关联模糊评价法对岷江上游生态环境地质质量进行了定量评价。
In the past decades , some factors of over - loaded caarrying capacity of population , backward modes of production , backward life style and ecological fragility in multi - ethnic areas of the upper reaches of minjing river resulted in ecological degradation , for instance , vegetation , grass degradation and soli erosion and natural calamities occurred frequently 摘要在过去几十年,由于人口超过环境承载量,人们生产方式和生活方式落后,以及生态脆弱等诸多因素,导致岷江上游民族地区生态环境退化,如植被,草场,土地的退化及自然灾害频繁发生等。