Combining the discharge theory of long gap, the operation experience and the result of simulation test, when the length of the short horizontal side needle is 20 cm or above in operation, the protection zone is about 6 m.
Finally, Regional protection and local protection of groundwater resources are discussed, and classification of vulnerability to pollution about aquifer and the methods to determining protection zone of groundwater supply are presented.
The accelerated development of urbanization increases the pollution load of urban lakes and rivers. The paper proposes the ecological protection zone of river bank, the restoration of aquatic vegetation, the use of microbial technology as well as the related ecological management model in order to put forward some suggestions for the plan of ecological city.
The protection zone of spherical false targets is calculated facing the application issues for laser angle deception jamming. The relationship among the protection zone, spherical radius and range is analyzed. The conclusions are shown that when the spherical radius is more than 1m, the zone protected by the spherical false targets is identical to that protected by surface false targets, and the deployment principle for surface false targets is applicable to the spherical false targets deployment.
Small rivers reflect to a considerable extent the general situation in the water-protection zone of the Ivankovo reservoir and make their negative contribution to worsening of water quality.
Optimization of the health protection zone and shield parameters for accelerators
Besides, the sea level rise forces the inland movement of this protection zone, which may cause serious conflicts on affected land owners.
An example is the construction of the new highway through the important glaciofluvial esker aquifer Nybro?sen, which passes the protection zone of the water supply for the Kalmar municipality, in the southeastern part of Sweden.
While a 35 km protection zone around breeding islands might be helpful to prevent competition of penguins with fisheries during the summer months, this might not improve the survival of migrating birds in the winter.