The problems of under water navigation by mine roller tram are discussed.

分析了矿山水下轮式采煤车的定位定向导航的可实现问题。

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According to the analyses, the North Channel is selution as the main deep-water navigation channel to the sea and is to be pre-trained, and the training principle of the Yangtze Estuary is determined.

在长期系统研究的基础上，分析对比了长江口的水流动力、泥沙运动和河床演变等各种条件，选择了北槽作为长江口深水航道先予治理，确立了符合长江口实际情况的治理原则。

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Today, rivers are controlled for many reasons, primarily to maintain reliable water supplies for daily, agricultural and industrial needs, for power generation, for navigation, and to prevent flooding.

今天，河流控制的原因有很多，主要是为了维持可靠的水资源供应，以满足日常生活、农业和工业、发电、航行的用水需要，并起到防洪作用。

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Lakes and reservoirs provide a range of resource values, including drinking water, irrigation water, navigation, fisheries, tourism, recreation, flood and drought management, climate mediation, as well as having religious and historic values.

UNESCO: Summary

In addition to impacts on farming and ranching operations, a long-term, widespread drought will also have implications for wildfires, water availability, navigation, and power generation across much of the country and across other sectors.

WHITEHOUSE: The White House

The Triumph is "in deep water and not near any hazards to navigation, " said Cmdr.

CNN: STORY HIGHLIGHTS