共查询到20条相似文献，搜索用时 234 毫秒
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水情信息采集系统GSM通信道的设计考虑 总被引：1，自引：0，他引：1
水情信息采集系统是应用遥测和现代通信技术,实现江河流域降雨量、水位、流量等数据的实时采集、报送和处理的信息系统。它具有传输数据量小、通信网络分布地域广以及通信条件比较恶劣等特点。本文针对水情信息采集系统GSM通信信道的设计,通过对移动通信基站覆盖情况的分析和研究,提出了设计考虑和相应的设计指标。 相似文献
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本文介绍了MSP430单片机的特点,从四个方面对其设计原理进行了描述,并对采集仪可靠性设计进行了介绍。基于MSP430的优点,采用超低功耗的MSP430单片机研制的水情信息采集仪,将具有良好的应用前景。 相似文献
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我国水文情报预报工作的主要成就及展望 总被引：2，自引：2，他引：0
新中国成立５０年来,水文情报预报工作取得了成就,在水情信息采集和传输方面,全国已有水文报汛站８０００余处,在２５处重点防洪河段和１５０座大型水库上建立了水文自动测报系统,共计有遥测站近２０００个,已有２２个省（市,区）和７个流域管理机构的水情部门通过计算机广域网互传水情信息。在水文预报技术方面,开发研制了适合中国特色的许多水文模型。随着计算机的广泛应用,水利信息中心初步建立了水雨情信息服务系统,包 相似文献
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景德镇水情分中心是国家防汛指挥系统工程示范区之一，在全国20个示范区工程建．设中首先通过验收，示范区的建设大大地改善了该地区的水文信息采集手段，实现了水位雨量观测长期自记、固态存储、自动传输，同时实现了水文数据远程下载以及水文资料整编、水情预报自动化。 相似文献
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为解决河网水情动态系统的数据同化问题,将水情量测数据作为内边界条件,建立了一个基于误差最小二乘原理的河网水情数据同化耦合模型.同时,为了有效控制水情状态变量的校正程度,避免因校正过度而破坏河网系统的水量平衡关系,构建了一个能有效控制及平衡各量测变量校正程度的权重矩阵.通过模拟算例和实例应用,系统检验了模型在河网水情仿真与预报中的实时校正能力,并得到了理想的结果.结果表明:模型理论完备、构建简便、数据同化可控性好,能够有效地进行河网水情动态系统的数据同化,提高河网水情仿真与预报的精度. 相似文献
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水文遥测系统能够对雨量、水位等水文信息进行自动采集、传输和处理,能有效提高水文信息传递的速度和可靠性.在水文测验、水情报汛、资料整编、水文预报、水情信息服务等领域中都起着十分重要的作用.本文阐述了德宏水文遥测系统的组成、功能原理及其综合应用. 相似文献
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This paper develops a risk de-aggregation and system reliability approach to evaluate the slope failure probability, pf, using representative slip surfaces together with MCS. An efficient procedure is developed to strategically select the candidate representative slip surfaces, and a risk de-aggregation approach is proposed to quantify contribution of each candidate representative slip surface to the pf, identify the representative slip surfaces, and determine how many representative slip surfaces are needed for estimating the pf with reasonable accuracy. Risk de-aggregation is performed by collecting the failure samples generated in MCS and analyzing them statistically. The proposed methodology is illustrated through a cohesive soil slope example and validated against results from previous studies. When compared with the previous studies, the proposed approach substantially improves the computational efficiency in probabilistic slope stability analysis. The proposed approach is used to explore the effect of spatial variability on the pf. It is found that, when spatial variability is ignored or perfect correlation assumed, the pf of the whole slope system can be solely attributed to a single representative slip surface. In this case, it is theoretically appropriate to use only one slip surface in the reliability analysis. As the spatial variability becomes growingly significant, the number of representative slip surfaces increases, and all representative slip surfaces (i.e., failure modes) contribute more equally to the overall system risk. The variation of failure modes has substantial effect on the pf, and all representative surfaces have to be incorporated properly in the reliability analysis. The risk de-aggregation and system reliability approach developed in this paper provides a practical and efficient means to incorporate such a variation of failure modes in probabilistic slope stability analysis. 相似文献
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多传感器数据融合技术在自控垂钻检测系统中的应用 总被引：6，自引：0，他引：6
多传感器数据融合技术是近几年发展起来的一门新兴技术，在军事和工业中有着广阔的应用前景，本文论述了多传感器数据融合的基本工作原理和过程，针对自控锤钻检测系统的特点和要求，提出了基于多传感器系统的顶角和方位角检测方案，给出了基于多传感器算术平均值与递推估计，多传感器算术平均值与分批估计二种数据融合计算方法，可有效地提高自控垂钻检测系统,抗干扰能力，以保证参数检测的可靠性和准确性。 相似文献
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同心式射流泵在深层井点降水中的应用 总被引：1，自引：1，他引：1
本文比较了几种深层干扰降水的特点，就国内深层降水设备存在的问题，有针对地研制了同心式射流泵井点降水系统，该系统利用喷射泵真空和排出口压力提升地下水，其降水深度大，集水效果好，出水量稳定，速度较快，设备结构简单可靠，解决了深大基坑砂、粘土地层中干扰降水的问题。 相似文献
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Reliability-based analysis of cantilever retaining walls requires consideration of different failure mechanisms. In this paper, the reliability of soil-wall system is assessed considering two failure modes: rotational and structural stability, and the system reliability is assumed as a series system. The methodology is based on Monte Carlo Simulation (MCS), and it deals with the variability of the design parameters in the limit equilibrium analysis of a wall embedded in granular soil. Results of the MCS indicate that the reliability of the failure components increases exponentially by increasing the variability of design parameters. The results of the system reliability indicate how the system reliability is different from the component reliabilities. The strength of the weakest component influences the reliability of the system. The system reliability index increases with the wall section gradually. However it remains constant for the rotational failure mode. 相似文献
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In this paper, a system reliability analysis of rock slope stability with considering all input parameters as stochastic parameter is presented. To perform reliability analysis a cut-set system has been used. For this purpose, Sequential Compounding Method (SCM) as a powerful method for reducing the computational time and accurate evaluation is employed to determine the reliability indices with considering correlations between failure modes which are calculated by defining equivalent linear safety margin for each failure mode. Furthermore, the 3-D system probability of failure surface is presented and the probabilistic model is developed to evaluate the rock slope probability of failure. 相似文献
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多层土坡在岩土工程实际中十分常见,不仅土体参数存在一定的空间变异性,而且土体框架呈现明显的层状分布特征,然而目前对考虑土体参数空间变异性的多层土坡稳定可靠度研究的远远不够。提出了基于多重响应面边坡系统可靠度分析的蒙特卡洛模拟（MCS）方法,给出了计算流程图,系统地研究了考虑土体参数空间变异性的多层土坡系统可靠度问题。结果表明,提出方法能够有效地分析考虑参数空间变异性低失效概率水平的多层土坡系统可靠度问题,并且具有较高的参数敏感性分析计算效率。 相似文献