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Open Access Original Research

Wind-Stress Variations from Deep to Shallow Water during Hurricanes for Air-Sea-Land Interaction Applications

Shih-Ang Hsu *

Louisiana State University, Baton Rouge, LA 70803, USA

* Correspondence: Shih-Ang Hsu

Academic Editor: Zed Rengel

Special Issue: Air-Sea Interaction and Marine Meteorology

Received: December 27, 2021 | Accepted: February 03, 2022 | Published: February 14, 2022

Adv Environ Eng Res 2022, Volume 3, Issue 1, doi:10.21926/aeer.2201006

Recommended citation: Hsu SA. Wind-Stress Variations from Deep to Shallow Water during Hurricanes for Air-Sea-Land Interaction Applications. Adv Environ Eng Res 2022; 3(1): 006; doi:10.21926/aeer.2201006.

© 2022 by the authors. This is an open access article distributed under the conditions of the Creative Commons by Attribution License, which permits unrestricted use, distribution, and reproduction in any medium or format, provided the original work is correctly cited.

Abstract

In September 2020 Hurricane Sally impacted two National Data Buoy Center (www.ndbc.noaa.gov) buoys near its track: 42040 in the deep water and 42012 in the shallow. Using pertinent air-sea interaction formulas from the literature, analyses of these buoy data indicate that, under fully rough airflow and wind sea conditions, U* = a Hs2 /Tp3 + b, here U* is the friction velocity, Hs is the significant wave height, and Tp is the peak wave period. It is found that a = 28 and b = 0.12 for the deep water environment, a = 30 and b = 0.26 for the shoaling wave environment, and a = 31 and b = 0.14 for the transitional water-depth environment, respectively. All units are in SI. Verifications and applications of these proposed formulas to estimate storm surge, wind speed, surface currents and seabed scours are presented. Because an extensive network for monitoring waves along the coastlines of the United States by the Coastal Data Information Program (CDIP) (CDIP About (ucsd.edu)), these proposed formulas are particularly useful. In addition, it is demonstrated that the parameter of wave steepness can be used to explain why there are large variations in the drag coefficient and wave-age formulations in the literature.

Keywords

Friction velocity; significant wave height; peak wave period; wave steepness; Hurricanes; air-sea-land interactions

1. Introduction

The wind stress [$\tau$ = ρU*2 = ρCdU102, in Pascal or N m -2, here ρ (≈1.2 kg m -3) is the air density for the moist tropical air, U* is the friction velocity in m s -1, Cd is the drag coefficient and U10 is the wind speed at 10 m in m s -1] on the water surface affects nearly all air-sea-land interaction processes, see, e.g., [1,2] for deep and [3,4] for shallow water environments, respectively. For extensive reviews of the wind stress formulations over deep and shallow water, see, e.g. [5,6]. However, as indicated in the literature, large variations in Cd exist. In addition, information on the variation of wind stress from deep to shallow water under the influence of the same atmospheric forcing such as during a tropical cyclone are lacking. Therefore, the aim of this article is to bypass the usage of Cd but to relate the U* (for the atmospheric forcing) and wave parameters (for the ocean response) directly.

In 2020, the National Data Buoy Center (www.ndbc.noaa.gov) maintained two buoys (42040 at water depth of 192 meters and 42012 at 23.5 m) during the passage of Hurricane Sally (see Figure 1 for their locations with respect to the Sally’s track). During a tropical cyclone (TC) worldwide, the Regional and Mesoscale Meteorology Branch (RAMMB) of NOAA/NESDIS (http://rammb.cira.colostate.edu/) issues real-time TC surface wind analysis. On the basis of these analyses, Figures 2 and 3 indicate that there were persistent onshore winds which impacted the meteorological and oceanographic (met-ocean) conditions at Buoy 42012 where the air pressure dropped from 1010 to 970 hPa as depicted in Figure 4 as the wind speed (Figure 5) at 3.8m increased from 15 to 32 m s -1. During the same period, the wave direction was persistently onshore (Figure 6) and wave steepness (Figure 7) increased from 0.02 to over 0.05 for the wind seas [7] (for the definition, see next section). This event provides us an opportunity to diagnose the variations of wind stress from deeper sea at Buoy 42040 to the shallower water at 42012 using the met-ocean datasets as measured by these two NDBC buoys during Sally. After these evaluations, practical formulas to estimate the wind stress from deep to shallow waters will be provided for air-sea-land interaction investigations. Examples for these applications are also given. Since the wind stress formulation in the deep water has been provided elsewhere [8], this report may be considered as a supplement of that article.

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Figure 1 Portions of Sally’s track (in yellow pins from 14 to16 September 2020) which affected our study area when it was over the north central Gulf of Mexico based on 2020 Atlantic Hurricane Season (noaa.gov) see www.nhc.noaa.gov/data/trc/. Red pins are for the routine Automated Surface Observing System (ASOS) stations and green ones for the NDBC buoys (see www.ndbc.noaa.gov).

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Figure 2 Variations of wind speed (in knots; 1 knot equals approximately 0.51 m s -1) and direction including the isotachs (equal wind speed lines) near Buoy 42040 at 12UTC on 15 September 2020 during Sally based on RAMMB: TC Real-Time: AL192020 - Hurricane SALLY - Multiplatform Satellite Surface Wind Analysis (Experimental) (colostate.edu). For the explanation of multi-platform tropical cyclone surface wind analysis at 10 m over the ocean, see RAMMB: TC Real-Time: Descriptions of Products (colostate.edu).

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Figure 3 Same as Figure 2 but for wind speed and direction near Buoy 42012 at 09UTC on 16 September 2020 during Sally.

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Figure 4 Measurements of atmospheric pressure at Buoy 42012 during Sally.

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Figure 5 Measurements of the wind speed at 3.8 m at Buoy 42012 during Sally.

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Figure 6 Measurements (available hourly) of the wave direction at Buoy 42012 during Sally.

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Figure 7 Measurements of wave steepness (available hourly) at Buoy 42012 during Sally (for the definition of wave steepness and criterion for the wind sea, see [7]).

2. Methods

At the air-sea interface when the mechanical turbulence dominates the vertical temperature stratification, the dry-adiabatic lapse rate at approximately -1°C per 100 m prevails, so that the logarithmic wind profile exists such that [9,10,11]

\begin{array}{*{20}{c}} {Uz\; = \left( {U*/k} \right)\ln \left( {Z/{Z_o}} \right) } \tag{1} \end{array}

Here Uz is the wind speed at height Z, k (=0.4) is the von Karman constant, and Zo is the aerodynamic roughness length.

To ensure that Equation (1) is valid in our study area during Sally, Table 1 is provided. Because the vertical temperature gradient is (26.7-27.9)/ (160-3.8) = -0.0077 or -0.77/100 m, dry adiabatic lapse rate or neutral stability (D) prevailed, see, e.g., [11] (Table A.3).

Table 1 Thermodynamic conditions in the study area during Sally in September 2020.

Now, according to [13]

\begin{array}{*{20}{c}} {{Z_o} = \;1200{H_s}{{\left( {{H_s}/{L_p}} \right)}^{4.5}} } \tag{2} \end{array}

Here Hs is the significant wave height and Lp (= 1.56Tp2) is the peak wave length and Tp is the peak wave period. Note that the parameter Hs/Lp is defined as the wave steepness and when Hs/Lp > 0.020, wind seas prevail [14].

In addition, following [1] (Equation (2.14), p. 68)

\begin{array}{*{20}{c}} {g{H_s}/U{*^2}\; = 0.061{{\left( {g{T_p}/U*} \right)}^{3/2}}\; } \tag{3} \end{array}

Here g (= 9.8 m s -2) is the gravitational acceleration. By substituting the value of g into Equation (3), one gets

\begin{array}{*{20}{c}} {U*\; = \;27.4{H_s}^2/{T_p}^3 } \tag{4} \end{array}

During Sally both wind and wave parameters were measured at NDBC Buoys 42040 and 42012. These datasets can be employed to diagnose the variation of wind stress from deep to shallow water using aforementioned equations.

3. Results

According to [13], the shoaling depth equals approximately 0.25Lp = 0.25*1.56Tp2 = 0.39Tp2. In addition, when Hs/Lp > 0.020, wind seas prevail [14]. Using the peak or dominant wave period measurements from Buoy 42040 and 42012, one can estimate the relation between the friction velocity for atmospheric forcing and wave conditions for direct ocean response. This is done as follows:

3.1 Deep Water Environment

During the passage of Sally at 0150 UTC on 15 September 2020, Buoy 42040 stopped recording so the wind data from the anemometer located at 3.8 m was no longer available. However, enough datasets including U3.8m, Hs, and Tp are useful for our analysis. Figure 8 shows our results that

\begin{array}{*{20}{c}} {U*\; = 28{H_s}^2/{T_p}^3 + \;0.12 } \tag{5} \end{array}

With a coefficient of determination R2 = 0.87, meaning that 87% of the variation of the friction velocity can be explained by the wave effects. Also, since the difference between Equations (4) and (5) is small, our method is reasonable.

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Figure 8 Relation between the friction velocity and wave parameters in the deep water at Buoy 42040 during Sally.

3.2 Shoaling Wave Environment

As stated previously, the shoaling depth = 0.39Tp2 so that at the depth of 23.5 m at Buoy 42012, when Tp > 7.8 seconds, shoaling waves prevail. Therefore, when all shoaling waves were taken into considerations, the relation between U* and wave parameters in the shallow water is found and presented in Figure 9. Our results for the shallow water environment is

\begin{array}{*{20}{c}} {U*\; = 30{H_s}^2/{T_p}^3 + \;0.26 } \tag{6} \end{array}

with R2 = 0.90, meaning that 90% of the variations in U* can be explained by the wave response.

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Figure 9 Relation between the friction velocity and wave parameters in the shallow water at Buoy 42012 during Sally.

3.3 Transitional Water-Depth Environment

Because the shoaling depth may vary from 0.2Lp to 0.25Lp [13] and the bathymetry may also vary within a smaller area [15], U* may change from deep to shoaling during a short period of time or within a smaller zone. In order to take these transitional water-depth environments into account, Figure 10 is presented. It is found that

\begin{array}{*{20}{c}} {U*\; = 31{H_s}^2/{T_p}^3 + \;0.14 } \tag{7} \end{array}

with R2 = 0.93.

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Figure 10 Relation between the friction velocity and wave parameters in a transitional water-depth environment at Buoy 42012 during Sally.

4. Applications

4.1 Estimating the Storm Surge

In 2005, Hurricane Katrina (Figure 11) devastated Louisiana/Mississippi coasts. At NDBC Buoy 42040, the largest Hs was measured at approximately 17m and Tp was 14.3 seconds (Figure 12). The maximum storm surge on the Mississippi Gulf Coast reached 33ft (10 m) as depicted in Figure 13. Because Buoy 42040 was located in deep water and by substituting these wave measurements into Equation (5), one gets U* = 2.89 m s -1. Therefore, the wind stress which generated the storm surge [16] was $\tau$ = 1.2*2.89 2 = 10 Pa. Hence, the max storm surge of 10 m can be explained by the wind stress forcing. This is consistent with the wind-tress tide relation as proposed in [16].

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Figure 11 Hurricane Katrina's track and NDBC stations. Katrina's track (in red with the start of each day numbered) is from the positions of the National Hurricane Center's Forecasts/Advisories (http://www.ndbc.noaa.gov/hurricanes/2005/katrina/ ). NDBC - Reports from the National Data Buoy Center's Stations in the Gulf of Mexico During the Passage of Hurricane Katrina (noaa.gov).

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Figure 12 Measurements of Hs and Tp at NDBC Buoy 42040 during Hurricane Katrina in 2005 based on NDBC - Reports from the National Data Buoy Center's Stations in the Gulf of Mexico During the Passage of Hurricane Katrina (noaa.gov).

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Figure 13 A section of high water mark surveys along the Mississippi Coast after Katrina [17].

4.2 Estimating Near-Surface Currents

In 2004 during Hurricane Ivan, extreme waves and currents were measured [15] as listed in Table 2 (except Mooring M6 because its Tp < mean wave period). Under these transitional water-depth conditions, Equation (7) is verified using Equation (8) which is based on [18] (Eq. 4), since U* can also be estimated by the sea-surface current, Usesa as

\begin{array}{*{20}{c}} {{U_{sea}}\; = \;0.57U* } \tag{8} \end{array}

Table 2 Measurements of waves and currents under Ivan’s (2004) transitional water-depth conditions [15]. Other parameters are computed based on equations as provided in the text.

4.3 Estimating Wind Speed with Height

For air-sea interaction studies, the wind speed at 10 m, U10, is needed. From Equation (1), by setting Z = 10 m. we have

\begin{array}{*{20}{c}} {{U_{10}}\; = \;2.5U*ln\left( {10/{Z_o}} \right) } \tag{9} \end{array}

Using Equations (2) and (5) for deep water environment, Equation (9) is validated in Figure 14 during Hurricane Wilma in 2005 near NDBC Buoy 42056 in the northwestern Caribbean Sea.

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Figure 14 Validation of Equation (9) during Hurricane Wilma in 2005.

Another example for the estimation of U10 (= 45 m s -1) over the transitional water is presented in Table 2. Our results are consistent with [19] (Figure 3 for the highest U10 = 45 m s-1). Using Equations (6) and (9), an example to estimate U10 for a shallow water environment is presented in the next subsection.

4.4 Value-Added Applications for CDIP Buoys

The Coastal Data Information Program (CDIP) (CDIP About (ucsd.edu)) is an extensive network for monitoring waves and beaches along the coastlines of the United States. Since its inception in 1975, the program has produced a vast database of publicly-accessible environmental data for use by coastal engineers and planners, scientists, mariners, and marine enthusiasts. CDIP is operated by the Ocean Engineering Research Group (OERG), part of the Integrative Oceanography Division (IOD) at Scripps Institution of Oceanography (SIO).

On 29 August 2021 Hurricane Ida devastated Southeast Louisiana (NWS LIX - Hurricane Ida Event page (weather.gov)). Figure 15 shows portions of Ida’s track and met-ocean stations employed in this study. Table 3 is a list of largest Hs measurement from Buoy 42084 (also named CDIP Station 256) on 29 August 2021 during Ida. Since the CDIP buoys do not have the wind measurements, we can estimate U* and U10 as value-added parameters based on aforementioned equations. This is accomplished as follows:

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Figure 15 Portions of Ida’s track from 1200 UTC to 1800 UTC on 29 August 2021and met-ocean stations used in this study.

Table 3 Largest Hs measurement at NDBC Station 42084 (CDIP Buoy 256) at 1700 UTC on 29 August 2021 at water depth = 44.8 meters in shoaling wave conditions during Hurricane Ida (Data source: https://www.ndbc.noaa.gov/data/stdmet/Aug/42084.txt). The highest sustained wind speed at 9.3m above the mean sea level at the National Ocean Service (NOS) Station at GISL1 was 32.4 m s -1 occurred at 1730 UTC on 29 August 2021 during Ida (Data source: https://www.ndbc.noaa.gov/view_text_file.php?filename=gisl182021.txt.gz&dir=data/stdmet/Aug/ ).

Since Tp = 11.11 second, the shoaling depth was 0.39*11.112 = 48 m. Because the water depth at Buoy 42084 was 44.8 m, shoaling wave conditions occurred (Table 3). Using Equations (6) and (9), both U* and U10 can be estimated. It is found that the estimated value of U10 is nearly the same as that measured at 9.3 m at the National Ocean Service (NOS) station at GISL1 as showing in Table 3. Furthermore, the values of Usea around 1 m s -1 as depicted in Figure 16 can be explained by the wind stress forcing using Equation (8). According to the National Weather Service (NWS) (NWS LIX - Hurricane Ida Event page (weather.gov)), the Grand Isle, LA area near Station GISL1 experienced over 3 m (10ft) storm surges. These coastal floods can also be explained physically by the wind stress forcing since $\tau$ = 1.2*U*2 =1.2*1.78 2 = 3.8 Pa, which is equivalent to 3.8 m [16]. In addition, this magnitude of the wind stress plus the associated storm surges was more than enough to damage the floating marshes and other wetland plants [3].

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Figure 16 Large near-surface currents (around 1 m s -1) generated by Ida at Buoy 42084 on 29-30 August 2021 based on Station Data Page Home (ucsd.edu).

4.5 Estimating Seabed Scour

According to [19], strong surface waves and currents generated by major hurricanes can produce extreme forces at the seabed that scour the sea floor and cause massive underwater mudslides. The combined current-wave stress, $\tau$cw, on the sea floor is approximately related to the wind stress, U102, that, for U10 > 15 m s-1,

\begin{array}{*{20}{c}} {{\tau _{cw}}\; = \;0.0004\;{U_{10}}^2 } \tag{10} \end{array}

Note that the unit of seabed stress is N m-2 or Pa.

In order to estimate the seabed scour, Figure 17 is presented [20] (for the datasets) so that

\begin{array}{*{20}{c}} {{d_{50}}\; = \; - 1.17\;{\tau _{cw}}^2\; + 3.37\;{\tau _{cw}}\;-\;0.33 } \tag{11} \end{array}

with R2 =1.0. Here d50 is the mean grain size in mm and $\tau$cw is the critical shear stress on the seabed to initiate the resuspension of the marine sediments.

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Figure 17 Relation between mean grain size, d50 in mm, and the critical seabed stress to initiate resuspension of marine sediments.

It can be seen that during Ivan (see Table 2), U10 = 45 m s -1. By substituting this wind speed into Equation (10), $\tau$cw = 0.81Pa. Now, substituting this $\tau$cw value into Equation (11), d50 = 1.63 mm, meaning those sediments with d50 finer than 1.6 mm would have been removed from the sea bed in the mooring areas as listed in Table 2. This physical mechanism may be used to explain the significant bottom scour on the outer shelf at water depths as deep as 90 m during the passage of Hurricane Ivan [15]. Using similar procedure for Hurricane Ida in 2021 (Table 3), we have $\tau$cw = 0.41 Pa and d50 = 0.85 mm, indicating that seabed area from 48 m water depth shoreward into the wetlands with sediments finer than 0.85 mm would have been scoured and removed by Ida.

5. Discussion

In deep water, according to [7], for the period of growing wind seas during Hurricane Matthew in 2017,

\begin{array}{*{20}{c}} {{U_{10}} = 35{H_s}/{T_p} } \tag{12} \end{array}

This equation is further verified in Figure 18 during Katrina (see Figures 11 and 12).

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Figure 18 Verification of Equation (12) during Katrina.

Now, dividing Equations (4) by (12) and setting Lp = 1.56Tp2, we have, for U10 > 9 m s -1 during wind seas and from Introduction,

\begin{array}{*{20}{c}} {U*/{U_{10}} = \;{C_d}^{0.5}\; = \;\alpha {H_s}/{L_p} + \;\beta } \tag{13} \end{array}

Here “α” and “β” are the coefficients to be determined from the field measurements.

Equation (13) is verified in Figure 19 for the deep water at Buoy 42040 during Sally that,

\begin{array}{*{20}{c}} {U*/{U_{10}} = \;{C_d}^{0.5}\; = 0.83{H_s}/{L_p} + \;0.017 } \tag{14} \end{array}

and in Figure 20 for the shoaling water at Buoy 42012 during Sally that,

\begin{array}{*{20}{c}} {U*/{U_{10}} = \;{C_d}^{0.5}\; = 0.81{H_s}/{L_p} + \;0.018 } \tag{15} \end{array}

In order to extend Equation (14) into larger wave height such as at Buoy 42040 during Katrina Hs =17 m, (see Figures 11 and 12), Figure 21 is presented that,

\begin{array}{*{20}{c}} {U*/{U_{10}} = \;{C_d}^{0.5}\; = 1.05{H_s}/{L_p} + \;0.0125 } \tag{16} \end{array}

Above equations indicate that Cd is very sensitive to Hs/Lp, Examples of the variations in the wave steepness on the right and left track during Katrina (see Figure 11) are provided in Figures 22 and 23, respectively. It is clear that on the right, wind seas prevailed and on left, mixed seas were the general rule. Therefore, caution must be exercised to use a proper Cd for different wave conditions. Equation (13) may be employed to explain why so many different Cd formulations existed in the literature. Future works should include the comparison between these proposed Cd formulae against implemented formula in waves model such as Zijlema 2012 formula [21] and in storm surge dynamics [22,23].

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Figure 19 Relation between dimensionless ratio of Cd 0.5 and wave steepness in deep water during Sally.

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Figure 20 Relation between dimensionless ratio of Cd 0.5 and wave steepness in shoaling water during Sally.

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Figure 21 Relation between dimensionless ratio of Cd 0.5 and wave steepness in deep water at Buoy 42040 during Katrina.

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Figure 22 Variation of wave steepness on the wind speed on the right side of Katrina’s track (see Figure 10).

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Figure 23 Variation of wave steepness on the wind speed on the left side of Katrina’s track see Figure 10).

Finally, from the literature, in order to estimate Zo or Cd, the inverse wave age, U10/Cp, is used [24,25]. By dividing both sides of Equation (12) by the wave celerity, Cp =1.56Tp, one gets

\begin{array}{*{20}{c}} {{U_{10}}/{C_p} = 35{H_s}/{L_p} } \tag{17} \end{array}

Equation (17) shows that U10/Cp is related linearly to the wave steepness, which is verified in Figure 24. Note that because the wave age requires both values of wind speed at 10 m and wave period whereas wave steepness only wave height and period which are available routinely in all buoy measurements including those from CDIP, the usage of wave steepness is preferred operationally. As stated in [14], using several datasets, the steepness model did better than the wave-age model when Hs/Lp ≥ 0.020 as employed in Equation (2) in this study.

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Figure 24 Verification of Equation (17) during Hurricane Wilma.

6. Conclusions

In the literature nearly all estimates of the wind stress on the water surfaces were based on the wind speed including the wave-age formulation which also requires the wind speed information. This study is motivated by the need to estimate the wind stress by the extensive datasets such as CDIP buoys which have only the wave measurements. During Hurricane Sally in 2020, two NDBC buoys (one was located in deep water and the other in shoaling water) provided both wind and wave measurements. Analyses of these measurements show that the friction velocity can be used to estimate the wind stress from deep to shallow water environments using the wave parameters only as presented in Equations (5) through (7). Applications of the proposed formulas for the estimations of storm surge, surface currents, wind speed and seabed scours are also presented. Finally, it is demonstrated that large variations of the drag coefficient and wave-age formulations in the literature can be explained using the parameter of wave steepness.

Acknowledgments

Appreciation goes to CDIP, FEMA, NDBC, NHC, NOS, NWS, and RAMMB for providing datasets used in this research.

Author Contributions

The author, Prof. S. A. Hsu, did all the work.

Competing Interests

The authors have declared that no competing interests exist.

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