- Отрасли: Government
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The United States Army Corps of Engineers is a federal agency with a mission to provide vital public engineering services in peace and war to strengthen the nation's security, energize the economy, and reduce risks from disasters. It is also a major U.S. Army organization employing some 38,000 ...
The French equivalent for a type of standing wave. In American usage it is usually associated with the standing wave phenomenon caused by the reflection of a nonbreaking wave train from a structure with a face that is vertical or nearly vertical. Full clapotis is one with 100 percent reflection of the incident wave; partial clapotis is one with less than 100 percent reflection.
Industry:Engineering
That method of sand movement in a fluid in which individual particles leave the bed by bounding nearly vertically and, because the motion of the fluid is not strong or turbulent enough to retain them in suspension, return to the bed at some distance downstream. The travel path of the particles is a series of hops and bounds.
Industry:Engineering
Force due to the Earth's rotation, capable of generating currents. It causes moving bodies to be deflected to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. The "force" is proportional to the speed and latitude of the moving object. It is zero at the equator and maximum at the poles.
Industry:Engineering
A very rapid rise of the tide in which the advancing water presents an abrupt front of considerable height. In shallow estuaries where the range of tide is large, the high water is propagated inward faster than the low water because of the greater depth at high water. If the high water overtakes the low water, an abrupt front is presented, with the high-water crest finally falling forward as the tide continues to advance. Also eager.
Industry:Engineering
The length of a minute of arc, 1/21,600 of an average great circle of the Earth. Generally one minute of latitude is considered equal to one nautical mile. The accepted United States value as of 1 July 1959 is 1,852 meters (6,076.115 feet), approximately 1.15 times as long as the U.S. statute mile of 5,280 feet. Also geographical mile.
Industry:Engineering
Mechanical plant characterized by the use of some form of bucket to excavate and raise the bottom material Normally, the mechanical dredge deposits material into a barge that transports it to the disposal site, but in some cases, the dredged material can be deposited directly in-water or placed on the bank immediately adjacent to the work area. Mechanical dredges may be classified into two sub-groups by how their buckets are connected to the dredge: (1) wire rope (i.e., clamshell or dragline), and (2) structurally (i.e., a backhoe).
Industry:Engineering
The plane or level to which soundings (or elevations) or tide heights are referenced (usually low water datum). The surface is called a tidal datum when referred to a certain phase of tide. To provide a safety factor for navigation, some level lower than mean sea level is generally selected for hydrographic charts, such as mean low water or mean lower low water.
Industry:Engineering
(1) A large body of salt water, second in rank to an ocean, more or less landlocked and generally part of, or connected with, an ocean or a larger sea. Examples: Mediterranean Sea; South China Sea.
(2) Waves caused by wind at the place and time of observation. (3) State of the ocean or lake surface, in regard to waves.
Industry:Engineering
A hypothetical extreme storm whose waves coastal protection structures will often be designed to withstand. The severity of the storm (i.e. return period) is chosen in view of the acceptable level of risk of damage or failure. A design storm consists of a design wave condition, a design water level and a duration.
Industry:Engineering
The diameter equivalent of the arithmetic mean of the logarithmic frequency distribution. In the analysis of beach sands, it is taken as that grain diameter determined graphically by the intersection of a straight line through selected boundary sizes, (generally points on the distribution curve where 16 and 84 percent of the sample is coarser by weight) and a vertical line through the median diameter of the sample.
Industry:Engineering
