Tidal Characteristic Numbers of Morphodynamics: Difference between revisions
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[[de: Tidekennwerte der Morphodynamik]] | [[de: Tidekennwerte der Morphodynamik]] | ||
==Motivation== | ==Motivation== | ||
Computation as well as graphical display of the tidal characteristic numbers of morphodynamics contribute to a better understanding of short term system behaviour of tidal estuaries and coastal seas. Morphological variability within a tidal cycle or over a spring neap cycle can be assessed. | Computation as well as graphical display of the tidal characteristic numbers of [[morphodynamics]] contribute to a better understanding of short term system behaviour of tidal estuaries and coastal seas. Morphological variability within a tidal cycle or over a spring neap cycle can be assessed. | ||
*Maximum, mean and minimum depth during one or several tidal cycles provide the setting, within which morphological changes can take place. Especially minimum depth values are of great interest for many navigational purposes. | *Maximum, mean and minimum depth during one or several tidal cycles provide the setting, within which morphological changes can take place. Especially minimum depth values are of great interest for many navigational purposes. | ||
*Tidal depth variation is ideal to describe morphological variability within a tidal cycle. Contrary, tidal depth change is well suited to characterise the respective integral depth change. The magnitude of tidal depth change is always less or equal to the respective tidal depth variation. | *Tidal depth variation is ideal to describe morphological variability within a tidal cycle. Contrary, tidal depth change is well suited to characterise the respective integral depth change. The magnitude of tidal depth change is always less or equal to the respective tidal depth variation. | ||
*The characteristic numbers for tidal erosion, tidal deposition as well as an additional dimensionless number help to clarify the significance of erosive as well as depositional processes at the bottom. Even when tidal depth variation and tidal depth changes are small, erosion as well as (compensating) deposition may still be strong and therefore relevant processes. | *The characteristic numbers for tidal [[erosion]], tidal deposition as well as an additional dimensionless number help to clarify the significance of erosive as well as depositional processes at the bottom. Even when tidal depth variation and tidal depth changes are small, [[erosion]] as well as (compensating) deposition may still be strong and therefore relevant processes. | ||
An automatic analysis of all tidal characteristic numbers of morphodynamics is carried through by the computer program [[TDKWF]]. | An automatic analysis of all tidal characteristic numbers of [[morphodynamics]] is carried through by the computer program [[TDKWF]]. | ||
==Definition of the Tidal Characteristic Numbers of Morphodynamics== | ==Definition of the Tidal Characteristic Numbers of Morphodynamics== | ||
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===Maximum Tidal Depth=== | ===Maximum Tidal Depth=== | ||
Greatest depth between two subsequent [[Tidal Characteristic Numbers of Water Level#Low Water Level (LW)|low waters]]. | Greatest depth between two subsequent [[Tidal Characteristic Numbers of Water Level#Low Water Level (LW)|low waters]].<br /> | ||
Example: Not yet available. | Example: Not yet available. | ||
===Minimum Tidal Depth=== | ===Minimum Tidal Depth=== | ||
Smallest depth between two subsequent [[Tidal Characteristic Numbers of Water Level#Low Water Level (LW)|low waters]]. | Smallest depth between two subsequent [[Tidal Characteristic Numbers of Water Level#Low Water Level (LW)|low waters]].<br /> | ||
Example: Not yet available. | Example: Not yet available. | ||
===Mean Tidal Depth=== | ===Mean Tidal Depth=== | ||
Mean depth between two subsequent [[Tidal Characteristic Numbers of Water Level#Low Water Level (LW)|low waters]]. | Mean depth between two subsequent [[Tidal Characteristic Numbers of Water Level#Low Water Level (LW)|low waters]].<br /> | ||
Example: Not yet available. | Example: Not yet available. | ||
===Tidal Depth Variation=== | ===Tidal Depth Variation=== | ||
Magnitude for the difference of maximum tidal depth and minimum tidal depth between two subsequent low waters. | Magnitude for the difference of maximum tidal depth and minimum tidal depth between two subsequent [[Tidal Characteristic Numbers of Water Level#Low Water Level (LW)|low waters]].<br /> | ||
Example: Not yet available. | Example: Not yet available. | ||
===Tidal Depth Change=== | ===Tidal Depth Change=== | ||
Difference between actual depth at the end and the beginning of a tidal cycle between by two subsequent [[Tidal Characteristic Numbers of Water Level#Low Water Level (LW)|low waters]]. | Difference between actual depth at the end and the beginning of a tidal cycle between by two subsequent [[Tidal Characteristic Numbers of Water Level#Low Water Level (LW)|low waters]].<br /> | ||
Example: Not yet available. | Example: Not yet available. | ||
===Tidal Erosion=== | ===Tidal Erosion=== | ||
Sum of all depth increments (deepening) within a tidal cycle, defined by two subsequent [[Tidal Characteristic Numbers of Water Level#Low Water Level (LW)|low waters]]. | Sum of all depth increments (deepening) within a tidal cycle, defined by two subsequent [[Tidal Characteristic Numbers of Water Level#Low Water Level (LW)|low waters]].<br /> | ||
Example: Not yet available. | Example: Not yet available. | ||
===Tidal Deposition=== | ===Tidal Deposition=== | ||
Sum of all depth decrements (shallowing) within a tidal cycle, defined by two subsequent [[Tidal Characteristic Numbers of Water Level#Low Water Level (LW)|low waters]]. | Sum of all depth decrements (shallowing) within a tidal cycle, defined by two subsequent [[Tidal Characteristic Numbers of Water Level#Low Water Level (LW)|low waters]].<br /> | ||
Example: Not yet available. | Example: Not yet available. | ||
===Tidal Deposition/Tidal Erosion=== | ===Tidal Deposition/Tidal Erosion=== | ||
Dimensionless number. Describes the relative significance of tidal deposition versus tidal erosion within a tidal cycle. Positive numbers indicate net deposition, whereas negative numbers indicate net erosion. A value of 1.0 corresponds to deposition with no erosion, whereas a value of -1.0 is equivalent to erosion with no deposition. Ín case of equilibrium between deposition and erosion the characteristic number will be 0.0. A tidal cycle is defined by two subsequent [[Tidal Characteristic Numbers of Water Level#Low Water Level (LW)|low waters]]. | Dimensionless number. Describes the relative significance of tidal deposition versus tidal [[erosion]] within a tidal cycle. Positive numbers indicate net deposition, whereas negative numbers indicate net [[erosion]]. A value of 1.0 corresponds to deposition with no [[erosion]], whereas a value of -1.0 is equivalent to [[erosion]] with no deposition. Ín case of equilibrium between deposition and [[erosion]] the characteristic number will be 0.0. A tidal cycle is defined by two subsequent [[Tidal Characteristic Numbers of Water Level#Low Water Level (LW)|low waters]].<br /> | ||
Example: Not yet available. | Example: Not yet available. | ||
Latest revision as of 09:25, 21 October 2022
Motivation
Computation as well as graphical display of the tidal characteristic numbers of morphodynamics contribute to a better understanding of short term system behaviour of tidal estuaries and coastal seas. Morphological variability within a tidal cycle or over a spring neap cycle can be assessed.
- Maximum, mean and minimum depth during one or several tidal cycles provide the setting, within which morphological changes can take place. Especially minimum depth values are of great interest for many navigational purposes.
- Tidal depth variation is ideal to describe morphological variability within a tidal cycle. Contrary, tidal depth change is well suited to characterise the respective integral depth change. The magnitude of tidal depth change is always less or equal to the respective tidal depth variation.
- The characteristic numbers for tidal erosion, tidal deposition as well as an additional dimensionless number help to clarify the significance of erosive as well as depositional processes at the bottom. Even when tidal depth variation and tidal depth changes are small, erosion as well as (compensating) deposition may still be strong and therefore relevant processes.
An automatic analysis of all tidal characteristic numbers of morphodynamics is carried through by the computer program TDKWF.
Definition of the Tidal Characteristic Numbers of Morphodynamics
Maximum Tidal Depth
Greatest depth between two subsequent low waters.
Example: Not yet available.
Minimum Tidal Depth
Smallest depth between two subsequent low waters.
Example: Not yet available.
Mean Tidal Depth
Mean depth between two subsequent low waters.
Example: Not yet available.
Tidal Depth Variation
Magnitude for the difference of maximum tidal depth and minimum tidal depth between two subsequent low waters.
Example: Not yet available.
Tidal Depth Change
Difference between actual depth at the end and the beginning of a tidal cycle between by two subsequent low waters.
Example: Not yet available.
Tidal Erosion
Sum of all depth increments (deepening) within a tidal cycle, defined by two subsequent low waters.
Example: Not yet available.
Tidal Deposition
Sum of all depth decrements (shallowing) within a tidal cycle, defined by two subsequent low waters.
Example: Not yet available.
Tidal Deposition/Tidal Erosion
Dimensionless number. Describes the relative significance of tidal deposition versus tidal erosion within a tidal cycle. Positive numbers indicate net deposition, whereas negative numbers indicate net erosion. A value of 1.0 corresponds to deposition with no erosion, whereas a value of -1.0 is equivalent to erosion with no deposition. Ín case of equilibrium between deposition and erosion the characteristic number will be 0.0. A tidal cycle is defined by two subsequent low waters.
Example: Not yet available.
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