stream sediment

A method for direct determination of multi-element in the stream sediment and soil samples by polarized energy dispersive X-ray fluorescence spectrometry with samples preparation of pressed powder pellets was developed.

采用粉末样品压片制样，用偏振能量色散X-射线荧光光谱仪对水系沉积物和土壤样品中多种元素进行测定。

Use a trowel to collect about 1 kg of sediment from the bottom of the stream.

利用一个小铲,收集大约1000克的河床物质样本.

In the high mountain area under arid climate, stream sediment geochemical survey at the 1/ 50000 scale was carried out with the sampling density of 4 points per square kilometer. The grain size of the sample in initial preparation stage was-20~+ 120 mesh.

在干旱高山景观区，以4点/km2的采样密度，选择-20~+120目粒级段为初加工粒级，开展1∶5万水系沉积物地球化学测量。

Abundance of elements in stream sediment and geochemical features of typical mining areas in Liaoning

辽宁水系沉积物元素丰度及典型矿区地球化学特征

After correcting the concentration Clarke with the stream sediment accumulation coefficients, endogenic metalization scales of thirty-two kind elements were prognosised with the help of additive method of the order, and the prospect of silver and boron were analyzed.

在利用水系沉积物富集系数估计值对浓度克拉克值进行校正后，使用顺序号累加法对福建省32种元素内生成矿作用的规模进行预测排序，并分析了银、硼的资源潜力。

In Meizhou Bay, the strong tidal stream transports its mud and sand from open sea, but is restricted to a certain extent, making the terrigenous clasts of the bay the main source of sediment.

湄州湾强劲的潮流导致外海泥沙输入，但受一定程度的限制，海湾周围的陆源碎屑成为沉积物质的主要来源。

Secondly, based on the discussion of condition of sediment incipient motion, the dimensionless unit stream power at sediment incipient motion is put up, so that the theory of sediment incipient motion become more integrated.

二是在对泥沙起动条件讨论的基础上，建立了泥沙起动的无因次临界单位水流功率，进一步完善了泥沙起动的有关理论；

The deposition of sediment in our natural stream channels has greatly aggravated floodwater damages.

泥沙淤积在天然河道,已大大加剧了洪水的危害.