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排序方式: 共有235条查询结果,搜索用时 15 毫秒
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南京市雨污分流改造经过多年建设施工,基本上从源头上实现雨污分流,避免污水溢流入秦淮河。初期雨水造成的城市非点源污染是受纳水体的重要污染源,在一些实施了分流制排水系统的城市,经过一段时间的运行,周边水体的污染情况改善不是十分明显。白下区雨污分流改造后,为避免初期雨水对内秦淮河污染,以大中桥泵站北截流沟为例,探讨在沿河截流井设提升泵弃流初期雨水,利用现状截流沟蓄水,结合规划改造大中桥泵站新建蓄水池,为今后雨水利用提供条件。 相似文献
44.
为解决中小城市污水排水问题,进一步加强城市排水管理,改善城市水环境,杜绝雨污混排,提高污水处理率,分析和探讨了中小城市在污水排水系统建设、管理、维护中存在的问题,针对排水法规不健全、污水管网不完善、雨污分流难、管理不到位等问题进行原因分析,提出加强排水制度建设、加快排水设施的建设、加强排水管理、加强宣传教育等措施. 相似文献
45.
The 4-year drawdown of Horsetooth Reservoir, Colorado, for dam maintenance, provides a case study analog of vegetation response
on sediment that might be exposed from removal of a tall dam. Early vegetation recovery on the exposed reservoir bottom was
a combination of (1) vegetation colonization on bare, moist substrates typical of riparian zones and reservoir sediment of
shallow dams and (2) a shift in moisture status from mesic to the xeric conditions associated with the pre-impoundment upland
position of most of the drawdown zone. Plant communities changed rapidly during the first four years of exposure, but were
still substantially different from the background upland plant community. Predictions from the recruitment box model about
the locations of Populus deltoides subsp. monilifera (plains cottonwood) seedlings relative to the water surface were qualitatively confirmed with respect to optimum locations.
However, the extreme vertical range of water surface elevations produced cottonwood seed regeneration well outside the predicted
limits of drawdown rate and height above late summer stage. The establishment and survival of cottonwood at high elevations
and the differences between the upland plant community and the community that had developed after four years of exposure suggest
that vegetation recovery following tall dam removal will follow a trajectory very different from a simple reversal of the
response to dam construction, involving not only long time scales of establishment and growth of upland vegetation, but also
possibly decades of persistence of legacy vegetation established during the reservoir to upland transition. 相似文献
46.
Clint J. Keifer David E. Westfall Dennis A. Fagan Fred C. Neat 《Journal of the American Water Resources Association》1979,15(1):17-29
ABSTRACT: The development of a regional water supply system for the six-county area of Northeastern Illinois is presented in this paper, including: 1) the establishment of regional water supply technical planning policies; 2) the development and utilization of a regional water supply computer model to identify the principal and secondary sources of water supply for each entity in the study area, based on an apparent cost-effective source analysis; and 3) utilization of the study results to develop for the year 2010 a suggested preliminary regional water supply system. Using the findings from task 2 above, a proposed plan for overall Lake Michigan water use through the year 2010 was also developed. The effects of the proposed regional water supply system on future water levels in the deep aquifer were also discussed. 相似文献
47.
分洪区数字地形模型建立及其应用 总被引:4,自引:0,他引:4
从实用的角度介绍了建立分洪区数字地形模型(DTM)方程,并给出了在分洪区信息可视化、分洪区特征曲线生成、分洪区二维洪水演进等等方面的应用。 相似文献
48.
David S. Bowles James L. Grant William E. Humphries Arthur P. O'Hayre 《Journal of the American Water Resources Association》1985,21(6):995-1003
A diversion system has been designed to carry the flow from East Fork of Coal Creek around the area proposed for mining at Thunder Basin Coal Company's (TBCC) Coal Creek mine in Campbell County, Wyoming. This paper describes the field and analysis procedures necessary to prepare the diversion design and impact evaluation, and the innovative concepts developed for the diversion system design to minimize impacts on downstream channel stability. Under the proposed diversion system design, water from the East Basin of Coal Creek will be diverted at two locations. At one location, flow will be impounded by a small dam and decanted by a pump through a pipeline into East Fork at the location of the second diversion. At this location, a training dike will be placed across the stream channel to divert flows into a diversion channel. Gravity flow along the diversion channel will deliver water to a playa area which will be converted into a detention basin by placing a small dam across its southern end. Flows up to the magnitude of the 24-hour 2-year peak flow will be passed directly through the detention basin into Middle Fork with negligible attenuation of flow rates. For less frequent events, water will be stored in the detention basin in order to prevent velocities in Lower Middle Fork from exceeding the maximum permissible velocity above which scouring may occur. Evaporation and seepage losses from the diversion system were estimated to be small and should be more than offset by the addition of water from the playa drainage basin into the Coal Creek drainage. Velocities predicted for the Lower Middle Fork after-the diversion is constructed are expected to be low enough that significant erosion of the channel is not expected to occur. 相似文献
49.
Rusidan Lubis Michael V. Martin B. Starr McMullen 《Journal of the American Water Resources Association》1987,23(4):673-680
ABSTRACT: Grain transportation is a major economic activity on the multiple use Snake-Columbia River System. Congress is currently considering increased transportation user fees aimed at recapturing federal expenditures for waterway operations and maintenance. Three types of fee structure and four levels of cost recovery are evaluated using a network program model. In each case traffic is diverted away from the river to other Puget Sound ports via truck and rail transport modes. Grain shippers in the region will be adversely affected by a higher transport bill. The Lower Columbia River port economic activities will be negatively affected; however, competitive uses of the river, recreation, and hydroelectric generation will likely benefit modestly. 相似文献
50.
N. Kitwiroon R. S. Sokhi L. Luhana R. M. Teeuw 《Water, Air, & Soil Pollution: Focus》2002,2(5-6):29-41
Many atmospheric dispersion models include only simpletreatment of surface features to estimate the wind profilesand stability parameters. Detailed characterisation of theland cover, particularly in large and complex urbanconurbations, is especially important, as the surfacefeatures can vary significantly over the area. This paperdiscusses the use of satellite land cover data to derivespatially resolved surface boundary layer (SBL) parameters.These parameters have been used in an air quality model,PEARL (Prediction Air Quality in Urban and RegionalLocations) for estimating monthly and annual COconcentrations. Land cover data, derived from LANDSATThematic Mapper Imagery, has been used to estimate SBLparameters (surface roughness length, albeedo, Bowen ratioand anthropogenic heat flux) for a study area of 10000km2 encompassing Greater London and the surroundingcounties. The SBL parameters have been assigned according tomajor land cover types for the whole area at a spatialresolution of 1 × 1 km. Predictions from two versions of the PEARL model (one with land cover data and one without)have been compared with each other and with measured data forannual and monthly CO concentrations from seven London airquality monitoring sites. This comparison shows thatdifferences between predicted and observed values can bereduced by up to a factor of three. The use of SBLparameters derived from land cover data also yields moredetailed predicted annual CO spatial patterns especially inand around suburban areas. The performance of both versionsof the model for monthly CO concentrations has been comparedwith a range of statistical measures. This comparisonconfirms that improved agreement is observed betweenmodelled and measured monthly CO concentrations when use ismade of spatially resolved SBL parameters. 相似文献