The depth of the river is maintained by dredging.

通过疏浚保持河道的深度。

《新英汉大辞典》

He says she never spotted a "river pig" in her childhood, but did witness the increasing dredging of the river to feed the construction sites on its Banks, and the resulting muddying of its waters.

他说她在童年时从未看到过“江猪”，但却见证了人们不断地挖掘河泥供应给岸上的建筑工地，由此污浊了河水。

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To restore coastal habitat, for example, the report advises using strategic dredging and river diversions to rebuild the rapidly disappearing wetlands of the Mississippi Delta.

例如，为了恢复海岸栖息地，报告中建议使用有效的疏浚和引流以重建快速消失的密西西比河三角洲的湿地。

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Ortega's forces are dredging the river as part of an Iranian-sponsored project to build a canal along the Isthmus of Nicaragua that will rival the Panama Canal.

CENTERFORSECURITYPOLICY: Why Latin America turned

One man spent months dredging the River Severn.

ECONOMIST: The man and his pen

Steps should certainly be taken to rebuild the coastal wetlands that have been eroded over time due to river dredging, oil drilling, and other human progressions.

CNN: Your e-mails: Balancing nature, commerce