IMPACTS OF DIMENSION AND SLOPE OF SUBMERGED SPUR DIKES ON LOCAL SCOUR PROCESSES - AN EXPERIMENTAL STUDY     

Daxian FANG Jueyi SUI Ronald W.THRING Hongya ZHANG 《国际泥沙研究》2006,21(2):89-100

1 INTRODUCTION In alluvial streams bed scour often occurs if the sediment load is less than the transport capacity of the flow. Two types of scour are identified, namely local scour and channel bed scour. Channel bed scour can be further classified accord…  相似文献   

互花米草试种及其在江堤闸浦护岸防塌中的应用   总被引：2，自引：0，他引：2  

吴绍镇  彭培相 《海洋学研究》1994,12(3):70-72

互花米草试种及其在江堤闸浦护岸防塌中的应用吴绍镇，彭培相（浙江省苍南县水利电力局，３２５８００）鳌江流域共有堤防８６．９ｋｍ，几十年来都是采用抛乱石建了坝做防护工程，但石料运输量大，施工速度慢，耗资巨大，因此用新的方式建造防护工程很有必要，为此，１９...  相似文献   

SEABEAM1185多波束系统的测量精度分析及在堤防监测中的应用     

赖仲淄  陈坚雄  郑道贤  潘剑中  吴宏旭 《海洋测绘》2007,27(6):58-61

通过与不同型号单波束测深仪的多种方式和角度的比测试验，验证了SEABEAM 1185多波束测深系统具有全覆盖扫测，测量范围大、速度快，测深精度和分辨率高等优点，突出其可靠性和稳定性。介绍了SEABEAM 1185系统的组成及其技术性能，并具体分析了系统在监测广东省某河道堤防险段的使用情况及应用价值。  相似文献   

Stability of the Guiding Dike in Yangtze Estuary Under the Wave Load   总被引：3，自引：0，他引：3  

闫澍旺 刘润范期锦  谢世楞 《中国海洋工程》2005,19(4):659-670

1 .IntroductionIt has beenrealizedthat constructing gravitystructures onsoft soil foundations is a difficult task,especiallyinthe marine area where boththe geological and environmental conditions are severe .Thisisnot only because the bearing capacity of the soft foundation is relatively low, but also because thestrength of the soft soil will befurther weakened bythe waveloading (Andersenet al .,1988 ;Ander-sen and Lauritzsen,1988 ; Yasuhara ,1988) .The strength weakening may cause serious d…  相似文献   

洞庭湖区堤防垂直防渗模型研究   总被引：1，自引：0，他引：1  

罗谷怀  罗玉龙  彭华 《岩土力学》2008,29(8):2287-2291

根据洞庭湖区堤防工程地质、地形特性,建立了多元结构堤基垂直防渗概化模型,并按照优化思想,采用渗流有限元法,对垂直防渗墙在砂卵石、相对不透水堤基中的贯入深度和堤内最大渗透坡降的位置、大小的关系做了系统地分析研 究。再根据有限元计算结果,全面地评价了两种型式防渗墙的防渗效果,提出了临界最优贯入深度的概念。最后,将有限元法应用到大东口电排高喷防渗墙工程中,实际工程的安全运营表明了研究结果的正确性和实用性。  相似文献   

新中国堤防建设与防洪     

尚全民 《防汛与抗旱》1999,(3):18-19

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长江堤防基础渗透破坏类型及其防渗治理分析     

白冰  周健 《上海国土资源》2000,(1):11-14

在长江沿线堤防基础下典型地层分布特征分析的基础上,研究了长江沿线堤防基础典型的渗透破坏类型,并提出相应的防渗治理措施及若干堤防渗流稳定的研究方法。  相似文献   

CHANNEL EVOLUTION AFTER THE CONSTRUCTION OF THE 1ST PHASE OF THE DEEPWATER CHANNEL PROJECT OF THE YANGTZE ESTUARY   总被引：1，自引：0，他引：1  

Hualin WU Huanting SHEN Yonghong WANG 《国际泥沙研究》2006,21(2):158-165

1 INTRODUCTION Among the world's rivers, the Yangtze River ranks third in length, fifth in average water discharge at its mouth, and fourth in suspended sediment discharge (Shen et al., 1983). The huge suspended load has created a bar system with heights greater than 10 m below sea level extending over 40 km along each waterway in the Yangtze Estuary (Milliman et al.,1985). Natural evolution of the sand bars has been studied by many scientists and engineers (Prichard, 1967; Ludwig and …  相似文献   

http://www.sciencedirect.com/science/article/pii/S1674987112000096     

Dedong Li  Yuwang Wang  Jingbin Wang  Zhaohua Luo  Jiulong Zhou  Zongfeng Yang  Cui Liu 《地学前缘(英文版)》2012,3(5):717-728

According to the metallogenic theory by transmagmatic fluid(TMF).one magmalic intrusion is a channel of ore-bearing fluids,but not their source.Therefore,it is possible to use TMF’s ability for injection into and for escaping from the magmatic intrusion to evaluate its ore-forming potential.As the ore-bearing fluids cannot effectively inject into the magmatic intrusion when the magma fully crystallized, the cooling time and rates viscosity varied can be used to estimate the minimum critical thickness of the intrusion.One dimensional heat transfer model is used to determine the cooling time for three representative dikes of different composition(granite porphyry,quartz diorite and diabase) in the Shihu gold deposit.It also estimated the rates viscosity varied in these lime interval.We took the thickness of dike at the intersection of the cooling time—thickness curve and the rates viscosity varied versus thickness curve as the minimum critical thickness.For the ore-bearing fluids effectively injecting into the magma,the minimum critical thicknesses for the three representative dikes are 33.45 m for granite porphyry,8.22 m for quartz diorite and 1.02 m for diabase,indicating that ore-bearing dikes must be thicker than each value.These results are consistent with the occurrence of ore bodies,and thus they could be applied in practice.Based on the statistical relationship between the length and the width of dikes.these critical thicknesses are used to compute critical areas:0.0003—0.0016 km~2 for diabase. 0.014—0.068 km~2 for quartz diorite and 0.011—0.034 km~2 for granite porphyry.This implies that orebearing minor intrusions have varied areas corresponding to their composition.The numerical simulation has provided the theoretical threshold of exposed thickness and area of the ore-bearing intrusion.These values can be used to determine the ore-forming potentials of dikes.  相似文献   

民主垸顺堤筑台建房存在的问题与整治建议     

孙佑芳  蔡剑文 《防汛与抗旱》2002,(3):56-57

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