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鉴于三峡工程大江截流是一项复杂的系统工程，具有水深大、流量大、抛投量大和截流期不断航等显著特点。水文泥沙监测作为其重要的组成部分，监测导流与截流过程中水流泥沙和水下地形的变化，为截流设计优化、调整施工方案与措施等提供科学的决策依据，同时也为导流明渠分流与通航、围堰度汛、截流水力学试验研究及水文预报、水文分析计算等提供水文原型观测资料。本文介绍了水文泥沙监测的目的、任务和水文数据采集、传输、处理与信息发布所采用的仪器设备与技术手段
In view of the large river closure of the Three Gorges Project is a complex system engineering, with the characteristics of large water depth, large flow, large throwing volume and continuous flow of the interception period. As an important component of hydrological and sediment monitoring, it monitors the changes of water and sediment and underwater topography in the process of diversion and closure, provides scientific decision-making basis for the design and optimization of river closure, and the adjustment of construction plans and measures, Diversion and navigation of open channels, flood control of cofferdam, pilot study of hydrological shutoff and hydrological forecasting and hydrological analysis and calculation. This paper introduces the purpose and mission of hydrological and sediment monitoring as well as the instrumental equipment and technical means adopted for the collection, transmission, processing and information dissemination of hydrological data