Gravel and boulders mining from mountain stream beds
نویسندگان
چکیده
منابع مشابه
Analysis of Gravel River Beds using Three-Dimensional Laser Scanning
The size and shape of the stones in dry gravel river beds are of interest in geology and river hydraulics. The topography of a bed surface can be measured by three-dimensional laser scanning. A method is described for fitting ellipsoids to the surfaces of individual stones to estimate their size, shape and orientation in the river bed. Different cost functions are evaluated and the methods are ...
متن کاملA new sampler for extracting bed material sediment from sand and gravel beds in navigable rivers
Grain-size distributions of bed material sediment in large alluvial rivers are required in various scientific and management applications, but characterizing gravel beds in navigable rivers is hampered by difficulties in sediment extraction. The newly developed and preliminarily tested sampler reported here can extract sediment from a range of riverbeds. The 36 × 23 × 28 cm stainless steel toot...
متن کاملMining Disjunctive Sequential Patterns from News Stream
Frequent disjunctive pattern is known to be a sophisticated method of text mining in a single document that satisfies anti-monotonicity, by which we can discuss efficient algorithm based on APRIORI. In this work, we propose a new online and single-pass algorithm by which we can extract current frequent disjunctive patterns by a weighting method for past events from a news stream. And we discuss...
متن کاملSequential Pattern Mining from Stream Data
Sequential Pattern Mining, briefly SPM, is an interesting issue in Data Mining that can be applied for temporal or time series data. This paper is related to SPM algorithms that can work with stream data. We present three new stream SPM methods, called SS-BE2, SS-LC and SS-LC2, which are the extensions of SS-BE. The proposed methods, similarly to SS-BE, are dealing with fixed-sized batches usin...
متن کاملAn Improved Method for Size Distribution of Stream Bed Gravel
Random sampling of surface rocks on a gravel bar is biased toward larger sizes which, because of their area, are more likely to be picked up. Weighting can eliminate this bias. Data on average weight, of a single rock are used to change numbers of rocks to weights, thus yielding size frequency data in general agreement with a sieved and weighed sample. The question of what to sample depends on ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: E3S Web of Conferences
سال: 2019
ISSN: 2267-1242
DOI: 10.1051/e3sconf/201910601005