The three patterns can be well differentiated by the straight lines represented by suspended sediment concentrations of C=60 kg/m 3 and C=3.3 kg/m 3. The two characteristic concentrations can be regarded as a reflection of the double thresholds in scour fill process of wide range water sediment two phase flows in rivers.
The cross section area of river channel and water level at Q=3000m 3 /s have been chosen for index of river channel shrink. Water sediment coefficient (averaged sediment concentration to averaged discharge)has been used as the variation of water and sediment condition. The relationship between river channel shrink and water sediment coefficient has been established.
The detection limit of Bi was 24ng/ml and relative standard deviation 3. 2% (n=5). The proposed method has been applied successfully to direct determination of Bi in water sediment. The recovery ranged between 99. 7-106. 8%.
The investigation of radioactivities in Taihu Lake and the Grand Canal in Anhui and Jiangsu Provinces was carried out in 1984.This paper represents the radioactive levels of to- tal α,total β,~(40)K,~(90)Sr,~(137)Cs,~(226)Ra,~(210)Po,~3H,natural U and Th in water,sediment deposit, bottom mud and fish.
This is the effect of the periodical change of the temperature, river flux and rain. Besides, the concentrations of y-HCH in water, sediment, soil, air and vegetation of L01 are in turn decreasing 92.6%, 80.0%, 77.3%, 71.4%and 55.6%.
Objective: To determine the levels of four haveay metals (Hg, Cd, Pb, As)in water, sediment and hydrobios from Wulabo, reservoir, Hongyanchi reservoir, and Caiwopu lake.
Contents of NP and NPnEO(n=1,2) were detected in water,sediment,plankton and fish,and the distribution of these compounds were studied in aquatics of Lanzhou reach of Yellow River.
This sediment fraction is subjected to variations of its physicochemical parameters (principally change of redox conditions) and therefore to pollutant exchange at the water/sediment interface.
The behavior of some macro-elements, trace elements and RE in the water/sediment systems, prepared as five different granulometric fractions of the sediment, was followed by INAA, AAS and titrimetric methods, under simulated natural conditions.
Three problems of heavy metal pollution in offshore sediment in Jingzhou Bay of the Bohai Sea were investigated in this work: (1) relation of concentration of zinc, cadmium, lead and copper with grain size of sediment; (2) partition of heavy metals between different geochemical phases in sediment, and (3) partition of heavy metals between different geochemical phases in the model of marin sediment, where flue dust, effluent, and suspended particles from the Huludao Zinc Smeltery situ...
Based on historical literatures and some available data, this paper summarizes human experiences about the regulation of the Jiaojian estuary and analyses the affect on the fluvial processes of estuary caused by regulating works. On the basis of its current regimes of water and sediment transportation and fluvial process, the utilization of water-sediment re-soureces is preliminarilly studied.
The evolution of the shoreline in a delta area has an unnegliegidle effect on the longitudinal profile of a river with a frequently changeable estuary. This paper shows the results of six experiment sets with different conditions of water-sediment inflow and tail-water-level hydrograph.A deve opment mode of the profile of an alluvial river is found as follows;1.In the case that the sea current can carry away the material coming from the river, the shoreline would be stable, a linear pro'fi...
water sediment
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