Spatial evolution equation of wind wave growth

Early in the thirties of the last century, the former Soviet scientists proposed characteristic waves (such as significant wave, and mean wave) to manifest the behavior of wind waves and began to study growth of wind waves. Later on Sverdrup and Munk[1] u…     

The 1786 earthquake-triggered landslide dam and subsequent dam-break flood on the Dadu River, southwestern China

Chinese historic documents recorded that on June 1, 1786, a strong M=7.75 earthquake occurred in the Kangding-Luding area, Sichuan, southwestern China, resulting in a large landslide that fell into the Dadu River. As a result, a landslide dam blocked the river. Ten days later, the sudden breaching of the dam resulted in catastrophic downstream flooding. Historic records document over 100,000 deaths by the flood. This may be the most disastrous event ever caused by landslide dam failures in the world. Although a lot of work has been carried out to determine the location, magnitude and intensity of the 1786 earthquake, relatively little is known about the occurrence and nature of the landslide dam. In this paper, the dam was reconstructed using historic documents and geomorphic evidence. It was found that the landslide dam was about 70 m high, and it created a lake with a water volume of about 50×10⁶ m³ and an area of about 1.7 km². The landslide dam breached suddenly due to a major aftershock on June 10, 1786. The peak discharge at the dam breach was estimated using regression equations and a physically based predictive equation. The possibility of a future failure of the landslide seems high, particularly due to inherent seismic risk, and detailed geotechnical investigations are strongly recommended for evaluating the current stability of the landslide.     

测绘专业《计算方法》课程教学方法初探

数据处理是测绘专业学生必须掌握的技术，测绘专业的《计算方法》课程就是为了加强学生这种技术能力的培养所开设。本文针对测绘专业的计算方法课程所存在的一些问题，在教学内容取舍，习题布置，上机实践以及考试方式等方面进行了探讨。     

Upper mantle convection driving by density anomaly and a test model

Introduction Richter and Mckenzie (1978) supposed that there is a small-scale convection system in the mantle. For a long time lots of research provides observational data to infer the possibility of a small-scale convection in the upper mantle. For example, Haxby and Weissel (1986) discussed the relationship between SEASAT map and small-scale convection. Baudry and Kroenke (1991), Maia and Diament (1991) found that the geoid and bathymetry exhibit peaks in the 400~650 km range in the Pa…     

衡重式挡土墙土压力的非线性分析

通过对挡土墙土压力非线性分析方法的研究 ,推导出了衡重式挡土墙土压力计算的数解公式 ,并编制了相应的计算程序 ,一般的直线型墙背挡土墙和折线型墙背挡土墙土压力计算均可作为本文计算公式的特例。通过对一折线型墙背重力式挡土墙的土压力计算与实测结果的比较表明 ,由本文公式所得的解与实测结果很接近。     

对地质勘查组织“产品”设计的理解

从讨论ISO 9000:2000标准“设计和开发”的定义出发,对地质勘查组织的的产品、产品质量特性和产品的设计进行了讨论,提出了地质勘查组织产品设计与标准中规定的设计和开发的概念以及对应关系,并对标准中的“设计和开发”与地质勘查组织“设计与开发”的内容进行了对比分析。     

煤田地质勘查组织需“确认的过程”辩识

对目前在煤田地勘单位贯彻ISO 9001:2000标准7.5.2条款中对需确认的过程的不同观点进行了分析,从“过程确认”的概念入手,并结合煤田地质勘查组织生产和服务提供过程及其特点,提出了煤田地质勘查单位需确认的过程的识别和控制方法。     

如何对煤田地勘单位质量管理体系进行审核

分析了煤田地勘行业产品的质量特性，煤田地勘行业的一般工作流程及过程控制的方法，并从识别过程、文件的有效性、采购的合法性、产品要求的评审、项目部的审核五个方面探讨了如何对煤田地勘单位质量管理体系进行审核。     

市局Domino邮件服务器管理维护

结合市局管理员的存取权限,介绍了Dom ino邮件服务器的安装、设置及日常维护。     

张北6.2级地震序列特征

１９９８年１月１０日张北６．２级地震后,我们根据《地震现场工作大纲和震情分析指南》用ｂ值ｈ值、ｕ值,ｋ值对该次地震序列进行了综合判定。结果认为此次地震为主震余震型。张北地震序列在衰减过程中出现以４级地震为峰值有节律的起伏,在时间上有较规则的准周期,且每一组起伏前密集－平静规律十分明显。