Since the 1990's,with the rapid development of computer technology and 3S applied in watersheds, the GIS can accurately and promptly resolve the spatial and temporal distribution of non-point source pollution according the topography and land-use change in the watershed, which the traditional models can not perform.
The energy resolution for 137Cs area source is less than 10%,the detection efficiency of total-absorption peak is 16. 3%and minimal detectable limit is 0. 06Bq (measurement time is 1000 min . , the confidence levelis 95%). In-situ measurements for 20 min.
Values computed by the American ATDL model for plane source are superimposed on the ones obtained by both of the above models and the outcome is found to be satisfactory by comparison with the observations from 26 monitoring cites.
The ratio of migration velocity of 3H and Br- is in the range of 078～094. The migration velocities of 3H or Br- at different distances and radial positions are same for point source or plane source.
Adopting the method of total quantity control air pollution thing in GB13201 - 91, this paper calculates total quantity of ambient air SO2 in the constructed district and Lower surface pollution source. Should main control lower surface source pollution.
(5) The sourcesink principle can be applied to non-point source pollution control, biologic diversity protection, urban heat island effect mitigation, etc.
At the same time, precipitation is the focus of study in meteorology and climatology, ecological environmental assessment, non-point source pollution and so on.
Role of rural solid waste management in non-point source pollution control of Dianchi Lake catchments, China
Populations of beef cattle represent a potential non-point source of environmental contamination for Cryptosporidium parvum if on-farm management practices fail to minimize transport from bovine manure to adjacent water sources.
The 10-year boundary conditions including tide, slinity, temperature, wind, heat exchange coefficient, river and non-point source flows were constructed.
A simplified method of global seismic hazard analysis is developed, based on an area source model and by using seismicity data, and the global seismic hazard map is compiled.
Aerial short-range dispersion of volatilized pesticides from an area source
In addition, at a height of 1.6?m downwind of the area source, measurements of the horizontal concentration profile were made up to a distance of about 250?m at roughly 50-m intervals.
At the coastal rural location, bacterial numbers normalised for temperature show no dependence on wind speed whilst at the inland sites there is a decrease with increasing wind speed of the form expected for a large area source.
A point p is said to be completely visible from an area source S if p is visible from every point in S .
This paper seeks for the line source and cylindrical plane source solutions of unsteady axisymmetrical two-dimensional flow through infinite and finite reservoirs with triple porosity.
Transient simultaneous measurements of thermal conductivity and diffusivity of Swedish wood have been performed with the plane source technique on oven-dry hardwood (birch) samples at room temperature and at 100?°C.
For these conditions, the continuity of mass transport in stationary and travel modes of the source has been solved using line and plane source models and conservation principles.
The plane source at infinity is at the same time parallel to the layers.
The paper presents a theoretical analysis of linear diffusion in the presence of convection with a constant flow rate for an instantaneous plane source and for diffusion in infinite capillary.
Boundary integral equations for the surface source distribution are derived.
The axisymmetric problem is treated on the formation of a turbulent circulation flow above a heated disk and on the turbulent diffusion of a passive scalar (impurity) from a continuous surface source in a stably stratified medium.
Displacement field Produced by a surface source of vibrations in a layered biological tissue
By means of a simple theory the power spectrumWφs of the random heat current ?s flowing into the gas (surface source) can be calculated from the observed noise voltage.
Temperature field in a two-layer plate heated by a surface source