局部流速 meaning in English

in-situ velocity
local flow rate

( 3 ) in excavation channel , the velocity in engineering area may be reduced , but the velocity in other areas of this channel may be increased and the flow condition may be deteriorated as a result of the increase of flow rate in this channel . thus , it should be discussed and studied before engineering practice
( 3 )在汊道的开挖中，工程区域的局部流速可能有所下降，但因分流比有所增加，可能导致其余部分河段的流速有所增加，恶化航行水流条件，因此在工程前需要进行充分的论证和深入的研究。
Excavating riverbeds in one channel may not only reduce the velocity area in some areas but also increase the velocity in other areas by increasing flow rate in this channel without correspondent changes in riverbeds of rocky rapids . in result , the velocity in waterway may be increased instead of be reduced , the flow condition may also be deteriorated . thus , which branch should be excavated and how to excavate in improving the flow condition of the branch should be further explored
但在分汊河道内，情况较为复杂，在一汊河道内采取开挖措施后，虽然其过水断面有所增加，局部流速相应降低，但是由于工程后，汊道的分流比将会相应变化，而石质河床一般无法通过冲淤变化以适应水流条件的改变，因此，航道内工程处的流速可能降低，也可能不降反而有所增加，恶化了航道的水流条件。