This paper discussed the renovation of a lake and expatiated the principle and methods of surveying on underwatertopography and sludge thickness.
本文就某湖泊的整治作一阐述，较详细说明水下地形与淤泥厚度测量原理及方法。
2
Combined with an underwatertopography survey case at a hydropower station, this paper found a feasible method to survey underwatertopography on swift current river.
本文结合某电站水下地形测量应用实例，找到了解决急湍河段水下地形测量的一种可行方法。
3
Based on the historical and present monitoring data, the underwatertopography, deposits, pollution sources and water environment quality of Kuncheng Lake of Changshu City were studied.