Surveying for underwater physical characteristics through Bathymetric and Hydrographic surveys is very popular nowadays.
Dredging, marine building, offshore drilling, and other marine operations are all influenced by variables under the sea’s surface, which is the science of quantifying all of these elements.
It is necessary to conduct bathymetry to map the underwater bottom with a high degree of precision.
Moreover, it will aid in the correlation and understanding of data received from other techniques that provide sub-bottom information and the ability to do a quality check on the findings. As previously stated, precision is critical since the other methods measure thickness from the bottom.
The technique works on the concept of sending an acoustic signal and measuring the time it takes to travel to determine depth. This method of depth conversion is accomplished by first calculating the velocity of sound in water at various depths and then converting the results. This calibration is performed twice a day to maintain high accuracy.
Both the Bathymetric and Hydrographic surveys are carried out in particular patterns. The bathymetric survey is carried out in a grid pattern. Precision positioning is accomplished via the use of a Differential Global Positioning System (DGPS).
Bathymetric surveys are used for a variety of various kinds of studies.
- Aerial view of a stream and a reservoir
- The process of scouring and stabilizing
- Studies on the quality of drinking water
- Taking down a dam
- Biological and chemical spills
Hydrographic survey is the study of measuring and describing characteristics that impact maritime navigation, marine building, dredging, oil exploration/drilling, pipeline damage assessment, and other related disciplines, like oceanography. Soundings for water depth, shorelines, tides and currents, and the seabed and submerged obstacles related to the activities listed above get a lot of attention in this section. Using hydrographic surveys, raw data gathered via the process is transformed into information that the end-user can use.
With the advent of GPS technology into the hydrographic surveying process, it became feasible to perform hydrographic surveys in real-time, allowing surveys to be completed without the need for conventional surveying equipment and allowing surveys to be conducted away from the shoreline.
Hydrographic Surveying Has a Wide Range of Uses
The following are some examples of hydrographic surveying’s applications:
- Dock and Harbor Engineering
- Works on the River
- Reclamation of lands
- Controlling Floods Using Water Power
- Sewage Removal and Disposal
Hydrographic surveying has a variety of applications.
The following are some of the applications of hydrographic surveying:
- It is possible to determine the depth of the bed.
- It is possible to identify shorelines.
- Preparation of a Navigation Chart
- Direct currents may be used to locate a sewage overflow.
- It is possible to determine the mean sea level by looking for signs of scouring, silting, and abnormalities in the bedrock.
- Measurement of the tides
- Monitoring the discharge of rivers and streams
- Massive infrastructure projects such as bridges, dams, and ports are being planned.
Both the Bathymetric and Hydrographic surveys use the science of measurement and description of characteristics that affect maritime navigation, marine building, and other activities, with a particular focus on detecting shallow regions that may be hazardous to shipping.