三峡库区经济发展评价     

陈国阶 《山地学报》1996,(1)

当前三峡库区经济发展存在主要产业经济效益低，国有产业亏损大，产业规模小，城镇经济中心作用弱等突出问题．库区开发必需是持久战和持续发展相结合，将库区基础设施建设放在重要地位，搞好资金、行业、所有制之间的优化组合，大力发展第三产业；要准备用几十年的艰苦奋斗，才能赶上全国平均水平．  相似文献   

结合卫星像影分析水库地震的形成原因     

孔凡健 《华南地震》1992,(2)

本文应用卫星影像分析了我国几个水库诱发地震震例,提出了库区内应力叠加模式,对水库地震的成因,做了探讨。  相似文献   

Optimal operation model of a single reservoir with drought duration explicitly concerned     

H. Tatano  N. Okada  H. Kawai 《Stochastic Hydrology and Hydraulics》1992,6(2):123-134

In this paper, a new model for a single reservoir operation optimization is proposed. The proposed model can design the optimal operation policy of a reservoir with explicit consideration of drought duration. The authors model this problem by formulating a single-stage loss function as a function of both the reservoir release and drought duration. Thereby the expected loss per period which is calculated based on the above extended single-stage loss function is minimized in infinite time horizon on the basis of Markov decision process (MDP) theory. The reliability indices are estimated as expected loss per period for specified extended loss functions. Finally, the features of the proposed model are illustrated through numerical analysis.  相似文献   

从水文地质条件探讨未来三峡水库发生构造型水库地震的可能性   总被引：3，自引：0，他引：3  

于品清 《华南地震》1993,13(1):76-83

从三峡水库区结晶岩区、沉积岩区和主要断裂的水文地质条件,即渗透性、聚积性看,未来三峡库区发生M_s≥4.0级构造型水库地震的可能性均较少。  相似文献   

NUMERICAL SIMULATION OF TURBIDITY CURRENT IN RESERVOIR     

YU  Wei-Sheng Post-Doctoral Fellow  Hydraulic Research Laboratory  National Taiwan University  Taipei  Taiwan  China LEE  Hong-Yuan Professor  Department of Civil Engineering  National Taiwan University  Taipei  Taiwan  China 《国际泥沙研究》1993,(2)

I. INTRODUCTIONWhen a sediment--laden flow reaches the backwater zone of a reservoir, the suddenreduction of flow velocity causes sediment particles to settle toward the river bed. Undercertain circumstsnces, it will plunge and form a layer of sediment--water mixture flowingbeneath the water surface. This flowing layer is called the turbidity current. A turbiditycurrent is relatively stable and has important impacts on reservoir sedimentation.In the case of deep reservoirs, due to temper…  相似文献   

Experimental analysis of reservoir release wave routing in upland boulder bed rivers     

D. J. Gilvear 《水文研究》1989,3(3):261-276

Reservoir release wave routing during 33 controlled reservoir releases, along 15 upland boulder bed river channel reaches, on five different regulated rivers were monitored to assess the importance of river channel roughness and reservoir release magnitude on reservoir release wave speeds. Wave speeds varied between 0.52 and 3.01 m s^?1. Reservoir release wave translation, steepening, and attenuation occurred. With high channel roughness values reservoir release wave arrival speed is retarded in comparison to peak stage and wave steepening occurs, but with a reduction in channel roughness reservoir release wave front arrival is accelerated producing attentuation. The threshold between reservoir release wave front attenuation and steepening occurs at a pre-release discharge/channel width of approximately 0.1, an index of channel roughness. The paper also demonstrates, via comparison of observed and calculated reservoir release wave speeds on the River Washburn, Yorkshire, the difficulty of accurately predicting flood wave movement in upland boulder bed channels using existing prediction equations. The calculated values, however, revealed systematic error with pre-release discharge and reservoir release magnitude. Apparently the equations fail to account for the effects of high channel roughness together with pressure gradient forces, induced by rapid rates of stage change on the rising limb of reservoir releases. In order to accurately predict reservoir release wave movement in regulated rivers, this paper demonstrates that hydraulic studies need to be undertaken and pre-release discharges prescribed to determine desired reservoir release wave routing behaviour. Manipulation of the reservoir release pattern at the dam alone, cannot dictate reservoir release wave front form downstream or wave speed.  相似文献   

Structured flow-based gridding and upscaling for modeling subsurface flow   总被引：2，自引：0，他引：2  

C. He  L.J. Durlofsky 《Advances in water resources》2006,29(12):1876-1892

  相似文献   

重庆市镇安场变形体与库岸岸勘查治理     

付治国  印修章  田修启 《中国地质灾害与防治学报》2006,17(1):28-32

对镇安场变形体、库岸特征及其稳定性研究目的是为三峡水库区三期地质灾害勘察与治理提供参考依据。通过对该变形体的工程地质勘察,取得了变形体及滑移带的近期变形特征,确定出变形体的稳定系数。给出变形体在天然状态下、连续高强度暴雨、水库蓄水位达175m及降至145m时荷载受力情况下的一系列参数,并作出稳定性简评。通过对库岸现状的定量勘查,采用对未来坍岸破坏方式的预测,用类比及计算法得出当库水位动、静态发生改变时变形体的变形情况及变形体与库岸防治设计的有关参数。其中浅基础下岩石地基承载力的经验参数为:强风化泥岩300kPa,强风化砂岩500kPa,中等风化泥岩1000kPa,中等风化砂岩2000kPa;基底摩擦系数为:泥岩0.4,砂岩0.5;墙后填土重度20kN/m3。按上述各项参数实施防治措施将取得较好的效果。  相似文献   

云南地热资源及其开发前景   总被引：1，自引：0，他引：1  

殷瑛  王明珠  何绕生 《云南地质》2006,25(1):70-75

云南地热异常多且显著。滇西高温水热活动区是藏滇水热带的南延，滇东断陷盆地中低温水热活动区的形成得益于独特的地质结构，滇西、滇南花岗岩地热系统则主要吸收地层中K^40同位索放射热而成。开发前景极为广阔。  相似文献   

舟坝水电站水库蓄水对乐山市地震活动的影响及对策     

彭云金  吕贵选  高福海  苟健  吕加蓉 《四川地震》2006,(1):44-46

在对铜街子水电站蓄水后库坝区及附近出现的地震活动特点进行分析的基础上,对另外一个舟坝水电站库坝区的地质结构和历史地震活动情况进行探讨,认为舟坝水电站蓄水产生诱发地震的可能性较大,五渡—利店断裂附近的马边、沐川、沙湾等地的诱发地震可能为5级以上,犍为县城附近可能出现的地震为4级左右。针对这些问题提出了减轻诱发地震造成损失的相应对策。  相似文献