Height Datum Unification by Means of the GBVP Approach Using Tide Gauges

Rangelova, Elena; Sideris, M. G.; Amjadiparvar, Babak; Hayden, T.

doi:10.1007/1345_2015_145

Cited by 8 publications

(4 citation statements)

References 10 publications

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“…This datum is assigned a value of 0.00 metres, (0.00 metres AHD-corrected), as the mean sea level for 1966-1968 [38]. It is important to note that the mean sea-level value should be calculated from 19-year-long continuous records of water levels [46], presenting a limitation to the accuracy of the Australian datum as this was only calculated over three years. The eBTM requires a starting point for the inland inundation to be modelled.…”

Section: Input Datamentioning

confidence: 99%

“…Consequently, it is inferable that the elevation is the variable driving the relationship between water bodies and their susceptibility to coastal inundation. As water bodies such as creeks and rivers largely feature physical characteristics of lower elevations and smaller changes in elevation (slope) than along coastlines, such areas are thus more conducive to inland coastal inundation [46]. While this is in part due to the Mackay study region being 365 km 2 , 67 times larger than the Cape Town study area of approximately 5.4 km 2 , this relationship is of note as it further affirms the strong relationship between elevation and inundation extent.…”

Section: Comparing Modelsmentioning

confidence: 99%

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Coastal Inundation Hazard Assessment in Australian Tropical Cyclone Prone Regions

Nguyen,

Kuleshov

2023

Hydrology

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One of the hazards associated with tropical cyclones (TCs) is a storm surge, which leads to coastal inundation and often results in loss of life and damage to infrastructure. In this study, we used GIS-based bathtub models and tide-gauge-derived water levels to assess coastal inundation scenarios for the landfall region of TC Debbie. The three scenarios modelled what could have happened if the TC’s maximum storm surge had coincided with the maximum storm tide for that day, month, or TC season, where the water levels were determined through analysis of tide gauge data, using a new method called the variable enhanced Bathtub Model. Additionally, this study analysed the impact of excluding the correction of water levels with the Australian Height Datum. Our study found that between the least and most severe scenarios, with the input water-level difference for the model along the coastline being 0.43 m, the observed inundation depth of the analysed populated region increased from 0.25 m to 1 m. Ultimately, it was found that in the worst-case scenario, the study region could have experienced coastal inundation 0.63 m higher than it did, inundating 72.53 km2 of the coast. The results of this study support the consensus that coastal inundation is highly dependent on the characteristics of the terrain, and that coastal inundation modelling, such as that completed in this study, needs to be performed to better inform decision makers and communities of the potential impacts of TC-induced storm surges.

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Section: Input Datamentioning

confidence: 99%

Section: Comparing Modelsmentioning

confidence: 99%

Coastal Inundation Hazard Assessment in Australian Tropical Cyclone Prone Regions

Nguyen,

Kuleshov

2023

Hydrology

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“…(3) The third method is estimating the anomalous potential by solving the geodetic boundary value problem (GBVP) [8]. It can provide a global solution for height unification, and the precision in well-surveyed regions reaches several centimeters [9][10][11]. However, in sparsely surveyed regions, the precision drops to the decimeter level [5].…”

Section: Introductionmentioning

confidence: 99%

Unification of a Global Height System at the Centimeter-Level Using Precise Clock Frequency Signal Links

Shen

Zhang

et al. 2023

Remote Sensing

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The International Association of Geodesy (IAG) aims to establish the International Height Reference System (IHRS) as one of its primary scientific objectives. Central to the realization of the IHRS is global vertical datum unification, which requires the connection of existing local vertical height reference systems (VHS) robustly and consistently. However, conventional methods are not suitable for estimating the offsets between two distant local height systems. In this paper, we propose a framework for connecting two local VHSs using ultraprecise clock frequency signal links between satellites and ground stations, referred to as the satellite frequency signal transmission (SFST) approach. The SFST approach allows for the direct determination of the geopotential and height differences between two ground datum stations without any location restrictions between the two VHSs. The simulation results show that the VHSs of China and the US can be unified with an accuracy of several centimeters, provided that the stability of atomic clocks used on-board the satellite and at on-ground datum locations reaches 4.8×10−17τ−1/2 for an averaging time τ (in seconds). We conclude that the SFST approach shows promise for achieving centimeter-level accuracy in unifying the global vertical height datum and represents a new paradigm for the realization of the IHRS.

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“…(3) The third method is estimating the anomalous potential by solving the geodetic boundary value problem (GBVP) (Rummel and Teunissen, 1988). It can provide a global solution for height unification, and the precision in well-surveyed regions reaches several centimeters (Amjadiparvar et al, 2016;Gerlach and Rummel, 2013;Rangelova et al, 2016). But in sparsely surveyed regions the precision drops to decimeter level (Sánchez and Sideris, 2017).…”

Section: Introductionmentioning

confidence: 99%

Unification of global vertical height system using precise frequency signal links

Shen¹,

Shen²,

Zhang³

2020

Preprint

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<p>The realization of International Height Reference System (IHRS) is one of the major tasks of the International Association of Geodesy (IAG). Here we formulate a framework for connecting two local VHSs using ultra-precise frequency signal transmission links between satellites and ground stations, which is referred to as satellite frequency signal transmission (SFST) approach. The SFST approach can directly determine the geopotential difference between two ground datum stations without location restrictions, and consequently determine the height difference of the two VHSs. Simulation results show that the China&#8217;s VHS and the US&#8217;s VHS can be unified at the accuracy of several centimeters, provided that the stability of atomic clocks used on board the satellite and on ground datum stations reach the highest level of current technology, about 4.8&#215;10<sup>-18</sup> in 100 s. The SFST approach is promising to unify the global vertical height datum in centimeter level in future, providing a new way for the IHRS realization. This study is supported by NSFCs (grant Nos. 41721003, 41631072, 41874023, 41804012, 41429401, 41574007) and Natural Science Foundation of Hubei Province of China (grant No. 2019CFB611).</p>

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Height Datum Unification by Means of the GBVP Approach Using Tide Gauges

Cited by 8 publications

References 10 publications

Coastal Inundation Hazard Assessment in Australian Tropical Cyclone Prone Regions

Coastal Inundation Hazard Assessment in Australian Tropical Cyclone Prone Regions

Unification of a Global Height System at the Centimeter-Level Using Precise Clock Frequency Signal Links

Unification of global vertical height system using precise frequency signal links

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