沉积物底质图
types and distributions of surface sediments map
池塘底质改良
Ponds bottom soil quality improvement
底质采样
bottom characteristics sampling
底质调查
bottom characteristics exploration
底质分类
bottom material classification
bottom sediment classification
substrate composition classification
Seafloor classification
seabed material classification
Seabed classification
seabed discrimination
底质改良
bottom characteristic improvement
底质颗粒物
substrate particulate matter
底质类型估计
estimation of bottom sediment type