AU2021106498A4 - Method and system for quantitatively analyzing evolution of submarine step-like landform - Google Patents
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Abstract
OF THE DISCLOSURE
) The present disclosure relates to a method and system for quantitatively analyzing an evolution
of a submarine step-like landform. The method includes: acquiring migration change data of a
spatial position of a terrace edge point over time; establishing a first quantitative calculation model
between an evolution process of a terrace topographic parameter and an environmental factor
according to the migration change data; determining parameters of the first quantitative calculation
model; obtaining a second quantitative calculation model according to the parameters and the first
quantitative calculation model; and analyzing an environmentally sensitive factor in formation of a
submarine step-like landform and a contribution of the environmentally sensitive factor according
to the second quantitative calculation model. The present disclosure can solve the problem that
quantitative analysis on the environmentally sensitive factor in formation of the submarine step-like
landform is cumbersome, and improve the accuracy of extraction and reconstruction of the
oceanologists for the key environmental information of the step-like landform.
14
-2/3
Sea level in (t+ A t) period
D(t+ t) Terrace edge point in
----- -- -- -- -- - L-t-t (t-A t) peri-od ----
E(t+ At) Point Sea level in t period
H(t+-t)-- - ------------------
G E(t) Point D(t) Terrace edge point in t period
SU(t) Paleo terrace edge point in
- -- (+ At) p eri od
E'(t+A) Point\
Topographic profile in t period
Topographic profile in (t+ A t) period \
FIG. 2
Description
-2/3
Sea level in (t+ A t) period
D(t+ t) Terrace edge point in ----- -- -- -- -- - L-t-t (t-A t) peri-od ---- E(t+ At) Point Sea level in t period H(t+-t)-- - ------------------ G E(t) Point D(t) Terrace edge point in t period
SU(t) Paleo terrace edge point in - -- (+ At) p eri od E'(t+A) Point\
Topographic profile in t period
Topographic profile in (t+ A t) period \
FIG. 2
[01] The present disclosure relates to the field of geophysical research in marine geology, and in particular, to a method and system for quantitatively analyzing an evolution of a submarine step-like landform.
[02] Step-like landform units are widespread at the peripheries of islets and edges of shelf-slope breaks. The unique landform records the spatio-temporal distributions about "baselines" in sediment accumulation to provide important analysis bases for high-accuracy reconstruction of paleo-sea levels, migration of coastal lines and evaluation on ecological statuses of the islets. In addition, it also records the subsidence processes of coral reefs to become an important information window for basic scientific research on submergence mechanisms of organic reefs, climatic evolutions and regional tectonic subsidence. Hence, the research for reconstructing key evolution information of marine environments with the submarine step-like landform is getting more and more attentions from oceanologists and marine engineers in home and abroad.
[03] However, the submarine step-like landform is typically formed under the action of one or more factors in vertical accretion and lateral progradation or retrogradation of sediments, sea-level fluctuation and submarine sedimentation. If main controlling factors (sensitive factors) of the submarine step-like landform cannot be determined, marine environmental information will not be extracted accurately. Previous research often qualitatively determines the main controlling factors of the submarine step-like landform, rather than quantitatively analyzes the environmentally sensitive factors of the submarine step-like landform, which greatly restricts the oceanologists to extract and reconstruct the key environmental information of the submarine step-like landform.
[04] An objective of the present disclosure is to provide a method and system for quantitatively analyzing an evolution of a submarine step-like landform, to solve the problem that quantitative analysis on the environmentally sensitive factor in formation of the submarine step-like landform is cumbersome, and improve the accuracy of extraction and reconstruction of the oceanologists for the key environmental information of the step-like landform.
[05] To implement the above objective, the present disclosure provides the following solutions:
[06] A method for quantitatively analyzing an evolution of a submarine step-like landform includes:
[07] acquiring migration change data of a spatial position of a terrace edge point over time;
[08] establishing a first quantitative calculation model between an evolution process of a terrace topographic parameter and an environmental factor according to the migration change data;
[09] determining parameters of the first quantitative calculation model, the parameters including a topographic slope, a sea-level rise rate, a basement subsidence rate, a vertical accretion or erosion rate and a lateral contraction rate;
[10] obtaining a second quantitative calculation model according to the parameters and the first quantitative calculation model; and
[11] analyzing an environmentally sensitive factor in formation of a submarine step-like landform and a contribution of the environmentally sensitive factor according to the second quantitative calculation model.
[12] Optionally, the migration change data may include a water depth, a sea-level rise value, a sea-level subsidence amount, an initial edge point position, an evolved edge point position, a vertical distance between the initial edge point position and the evolved edge point position, and a horizontal distance between the initial edge point position and the evolved edge point position.
[13] Optionally, the establishing a first quantitative calculation model between an evolution process of a terrace topographic parameter and an environmental factor according to the migration change data may specifically include:
[14] establishing the first quantitative calculation model between the evolution process of the terrace topographic parameter and the environmental factor according to the migration change data: S1i (k,y,t)+ Su,'(x,y,t)-D, (, y,t) tancp(x, y)-
[15] L,'(X, yt)
[16] where, Xl' respectively represent a longitude and a latitude of a spatial position, 0 is a slope, tis a sea-level rise rate, Su,' is a basement subsidence rate, D,' is a vertical accretion or erosion rate of an islet, L,' is a lateral contraction rate of an E point, and t is evolutionary time.
[17] Optionally, the determining parameters of the first quantitative calculation model, the parameters including a topographic slope, a sea-level rise rate, a basement subsidence rate, a vertical accretion or erosion rate and a lateral contraction rate, may specifically include:
[18] determining the topographic slope with a high-resolution multi-beam depth-sounding sonar system;
[19] determining the sea-level rise rate according to a global sea-level curve;
[20] determining the basement subsidence rate according to high-resolution seismic data;
[21] determining the vertical accretion or erosion rate according to a sediment profile recovered by a core sample drill; and
[22] determining the lateral contraction rate according to a seismic stratigraphic texture as well as a spatial range of retrogradation or progradation recorded in a topographic water-depth ) distribution.
[23] A system for quantitatively analyzing an evolution of a submarine step-like landform includes:
[24] a migration change data determination module, configured to acquire migration change data of a spatial position of a terrace edge point over time;
[25] a first quantitative calculation model determination module, configured to establish a first quantitative calculation model between an evolution process of a terrace topographic parameter and an environmental factor according to the migration change data;
[26] a parameter determination module, configured to determine parameters of the first quantitative calculation model, the parameters including a topographic slope, a sea-level rise rate, a basement subsidence rate, a vertical accretion or erosion rate and a lateral contraction rate;
[27] a second quantitative calculation model determination module, configured to obtain a second quantitative calculation model according to the parameters and the first quantitative calculation model; and
[28] an environmentally sensitive factor analysis module, configured to analyze an environmentally sensitive factor in formation of a submarine step-like landform and a contribution of the environmentally sensitive factor according to the second quantitative calculation model.
[29] Optionally, the migration change data may include a water depth, a sea-level rise value, a sea-level subsidence amount, an initial edge point position, an evolved edge point position, a vertical distance between the initial edge point position and the evolved edge point position, and a horizontal distance between the initial edge point position and the evolved edge point position.
[30] Optionally, the first quantitative calculation model determination module may specifically include:
[31] a first quantitative calculation model determination unit, configured to establish the first quantitative calculation model between the evolution process of the terrace topographic parameter and the environmental factor according to the migration change data: Si (i,y,t)+ Su,'(x,y,t)-D, (t, y,t) tan D(x, y)- 1321 L,'(x, y,t)
[33] where, X' Yrespectively represent a longitude and a latitude of a spatial position, 0 is a slope, is a sea-level rise rate, Su,' is a basement subsidence rate, D,' is a vertical accretion or erosion rate of an islet, L,' is a lateral contraction rate of an E point, and t is evolutionary time.
[34] Optionally, the parameter determination module may specifically include:
[35] a topographic slope determination unit, configured to determine the topographic slope with a high-resolution multi-beam depth-sounding sonar system;
[36] a sea-level rise rate determination unit, configured to determine a sea-level rise rate according to a global sea-level curve;
[37] a basement subsidence rate determination unit, configured to determine a basement subsidence rate according to high-resolution seismic data;
[38] a vertical accretion or erosion rate determination unit, configured to determine the vertical accretion or erosion rate according to a sediment profile recovered by a core sample drill; and
[39] a lateral contraction rate determination unit, configured to determine the lateral contraction rate according to a seismic stratigraphic texture as well as a spatial range of retrogradation or progradation recorded in a topographic water-depth distribution.
[40] Based on specific embodiments provided in the present disclosure, the present disclosure discloses the following technical effects:
[41] The present disclosure provides the method for quantitatively analyzing an evolution of a submarine step-like landform, including: acquiring migration change data of a spatial position of a terrace edge point over time; establishing a first quantitative calculation model between an evolution process of a terrace topographic parameter and an environmental factor according to the migration change data; determining parameters of the first quantitative calculation model; obtaining a second quantitative calculation model according to the parameters and the first quantitative calculation model; and analyzing an environmentally sensitive factor in formation of a submarine step-like landform and a contribution of the environmentally sensitive factor according to the second quantitative calculation model. The present disclosure can solve the problem that quantitative analysis on the environmentally sensitive factor in formation of the submarine step-like landform is cumbersome, and improve the accuracy of extraction and reconstruction of the oceanologists and marine engineers for the key environmental information of the step-like landform.
[42] To describe the technical solutions in the embodiments of the present disclosure or in the prior art more clearly, the accompanying drawings required for the embodiments will be briefly described below. Apparently, the accompanying drawings described below are merely some embodiments of the present disclosure, and a person of ordinary skill in the art may also obtain other accompanying drawings based on these accompanying drawings without creative efforts.
[43] FIG. 1 is a flow chart of a method for quantitatively analyzing an evolution of a submarine step-like landform.
[44] FIG. 2 is a schematic view of a migration and evolution process of a terrace edge point from a t period to a t + At period.
[45] FIG. 3 is a schematic structural view of a system for quantitatively analyzing an evolution of a submarine step-like landform.
[46] The technical solutions of the embodiments of the present disclosure are clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are merely a part rather than all of the embodiments of the present disclosure. All other embodiments obtained by the person of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.
[47] An objective of the present disclosure is to provide a method and system for quantitatively analyzing an evolution of a submarine step-like landform, to solve the problem that quantitative analysis on the environmentally sensitive factor in formation of the submarine step-like landform is cumbersome, and improve the accuracy of extraction and reconstruction of the oceanologists for the key environmental information of the step-like landform.
[48] To make the above-mentioned objectives, features, and advantages of the present disclosure clearer and more comprehensible, the present disclosure will be further described in detail below with reference to the accompanying drawings and the specific implementation.
[49] The present disclosure establishes multivariate function relations between a topographic parameter and influencing factors such as the vertical change (accretion or erosion) and lateral migration (retrogradation or progradation) of the seabed reference point, tectonic subsidence and sea-level change according to mathematical definitions of topographic factors, and establishes a quantitative evaluation model (mathematical model) for the influencing factors in the formation of the step-like landform with a multivariable nonlinear regression analysis method, thereby providing a quantitative calculation method for analysis on environmentally sensitive factors of the step-like landform and reconstruction on key marine environmental information. FIG. 1is a flow chart of a method for quantitatively analyzing an evolution of a submarine step-like landform. As shown in FIG. 1, the method for quantitatively analyzing an evolution of a submarine step-like landform includes the following steps:
[50] Step 101: Acquire migration change data of a spatial position of a terrace edge point over time, the migration change data including a water depth, a sea-level rise value, a sea-level subsidence amount, an initial edge point position, an evolved edge point position, a vertical distance between the initial edge point position and the evolved edge point position, and a horizontal distance between the initial edge point position and the evolved edge point position.
[51] The present disclosure defines the step-like landform at the periphery of the islet as the islet terrace. The terrace edge point is a point (like a "knickpoint") with an abrupt change at the transition from the top terrace to the slope. By labeling the terrace edge point in a period as (FIG. 2), the islet terrace may be viewed as a spatial combination formed by islet edge points in different periods. In this case, the formation of the islet terrace is transformed into a migration change process of the spatial position of the terrace edge point over the time.
[52] Step 102: Establish a first quantitative calculation model between an evolution process of a terrace topographic parameter and an environmental factor according to the migration change data, specifically including:
[53] Establish the first quantitative calculation model between the evolution process of the terrace topographic parameter and the environmental factor according to the migration change data: S1 ( ,y,t)+ Su,'(x,y,t)-D, ( , y,t)
[54] L'(x, Y,t)
[55] where, X' Yrespectively represent a longitude and a latitude of a spatial position, 0 is a slope, tis a sea-level rise rate, Su,' is a basement subsidence rate, D,' is a vertical accretion or erosion rate of an islet, L,' is a lateral contraction rate of an E point, and t is evolutionary time.
[56] Supposing that the water depth of the E(' distribution in a t period is labeled as D(r after a At evolution, the new edge point is labeled as E('+A) with the corresponding water depth being D(+A) ; the original edge point E(' is labeled as E'(+A) with the corresponding water
depth being H('+^A); and from the t period to the t+ At period, the sea-level rise value is labeled Si Su £ as the tectonic subsidence amount is (A) , (A) , the vertical distance between ('+A) and E'C(+A) is G(At) and the horizontal distance is L(A^) (as shown in FIG. 2), obtain: t G Gni=(A) H ,,,-D H (f--Ar) -D(r-Ar) - Sl(Ar),,+D ,+ Sug, -D,, +D(r) +S(Ar) -D(r--Ar) tan#8
[571 L(A) L(At) L(At) .
[58] According to the mathematical limiting principle and the mathematical definition of the topographic parameter, when At approaches 0, the left 9 changes into the slope D of the edge point of the islet. Differential approximation on the right of Eq. 2 leads to: tan =/ (1)*dt + Su'(t)* dt-D (t)* dt _ SI ()+ Su'(t)-D (f)
[59] L'(t)* dt L'(t) . . (2)
[60] If influences of different spatial positions are considered, Eq. (3) is converted as: S1 ( ,y,t)+ Su,'(x,y,t)-D, ( , y,t)
[61] L'(x, Y,t) (3)
[62] where, X'Y are respectively a longitude and a latitude of the spatial position.
[63] The quantitative relation between the topographic parameter of the islet terrace and the influencing factor is established through Eq. (3), and converted as:
SU, (k,y,t) D, (, y,t) tan@D(x,y)= Si (,y,t)
[64] L,(5c,y,t) L, (5,y,t) L, (5,y,t) (4)
[65] Seeking a logarithm on two sides of Eq. (4) further leads to:
[6 ln(tanO(x, y))=ln(Sl, (£, y, t)+ Su, (£,y, t)-D, ( , y, t))-ln(L, ( , y, t))..5
[67] Step 103: Determine parameters of the first quantitative calculation model, where five key parameters are provided in the model equation, and the parameters includes a topographic slope, a sea-level rise rate, a basement subsidence rate, a vertical accretion or erosion rate and a lateral contraction rate, specifically including:
[68] Step 1031: Determine the topographic slope with a high-resolution multi-beam depth-sounding sonar system.
[69] Step 1032: Determine the sea-level rise rate according to a global sea-level curve. Specifically, refer to the global sea-level curve presented by Miller et al. (2005) and Kominz et al. (2008).
[70] Step 1033: Determine the basement subsidence rate according to high-resolution seismic data.
[71] The basement subsidence rate may be calculated in a backstripping method with the high-resolution seismic data on the basis of the constructed seismic stratigraphic model. The basic principle is to calculate the subsidence value in an unused period by gradually stripping stratigraphic units having changing stratigraphic sequences, and performing a series of corrections (decompaction correction, sediment load correction, paleo-water depth correction and paleo-sea-level correction), with the following equation:
[72] Y=S(E!"LL)-ASL (- +Wd...(6) PmU-Pw Pm-Pw'
[73] where, Y is the tectonic subsidence amount in different periods.
[74] S is a sediment thickness after compaction correction, which is associated with the formation porosity and may be obtained from core sample drill data.
[75] p m is a mantle density, which is typically the upper mantle average density and is 3,200 kg/m3 .
[76] ps is an average density of the sediment column, which may be obtained with test upon the core sample drill data.
[77] p, is a density of void water, which may also be obtained with test upon the sediment core data.
[78] Wd is a paleo-water depth, which is determined and estimated jointly according to paleontological fossils recorded in the core sample drill.
[79] ASL is a height of the paleo-sea level relative to the present sea level and may refer to the global sea-level curve presented by Miller et al. (2005) and Kominz et al. (2008).
[80] Step 1034: Determine the vertical accretion or erosion rate according to a sediment profile recovered by a core sample drill.
[81] Step 1035: Determine the lateral contraction rate according to a seismic stratigraphic texture as well as a spatial range of retrogradation or progradation recorded in a topographic water-depth distribution.
[82] Step 104: Obtain a second quantitative calculation model according to the parameters and the first quantitative calculation model.
[83] Step 105: Analyze an environmentally sensitive factor in formation of a submarine step-like landform and a contribution of the environmentally sensitive factor according to the second quantitative calculation model, specifically including:
[84] The environmentally sensitive factor in the formation of the submarine step-like landform and the contribution thereof may be calculated and evaluated by using the second quantitative calculation model through multivariable nonlinear correlation analysis.
[85] For the quantitative function relations established with Eq. 3 between the topographic factor and four main environmental factors such as the sea-level change curve, the basement subsidence rate curve, the vertical sedimentation rate or erosion rate of the submarine sediment, and the lateral migration rate of the submarine sediment, determining any three environmental factors therein may reconstruct and calculate the rest one.
[86] The environmentally sensitive factor in the formation of the submarine step-like landform and the contribution thereof may be calculated and analyzed with Eqs. (4) and (5). S, (£,y,t) Su, ( ,y,t) D, (,y,t)
[87] In Eq. (4), L(,y,t) Lr(, y, t) and Lr ('Yt) are viewed as variable factors of tanol(x,y) to obtain a coefficient of correlation and a coefficient of partial correlation. Without
considering the influences of L'(x, y, t), si(S' ',yt) Su, ( S,y,t) and D, ( ,y,t) may be determined, i.e., the contributions of such influencing factors as the sea-level change, tectonic subsidence, and vertical accretion or erosion process of the islet to the formation of the islet terrace.
[88] In Eq. (5), Ln(Sl, (, y, t)+ Su, (, y, t)-D, (i,y, t)) and ln(L, ( y,',t)) are considered as influencing factors of ln(tanoD(x,y)) to obtain a coefficient of correlation and a coefficient of partial correlation, thereby determining ln(L, (>,y,t)), i.e., the contribution of the retrogradation or progradation process of the edge strata of the islet to the formation of the islet terrace.
[89] FIG. 3 is a schematic structural view of a system for quantitatively analyzing an evolution of a submarine step-like landform. As shown in FIG. 3, the system for quantitatively analyzing an evolution of a submarine step-like landform includes:
[90] a migration change data determination module 201, configured to acquire migration change data of a spatial position of a terrace edge point over time, the migration change data including a water depth, a sea-level rise value, a sea-level subsidence amount, an initial edge point position, an evolved edge point position, a vertical distance between the initial edge point position and the evolved edge point position, and a horizontal distance between the initial edge point position and the evolved edge point position;
[91] a first quantitative calculation model determination module 202, configured to establish a first quantitative calculation model between an evolution process of a terrace topographic parameter and an environmental factor according to the migration change data;
[92] a parameter determination module 203, configured to determine parameters of the first quantitative calculation model, the parameters including a topographic slope, a sea-level rise rate, a basement subsidence rate, a vertical accretion or erosion rate and a lateral contraction rate;
[93] a second quantitative calculation model determination module 204, configured to obtain a second quantitative calculation model according to the parameters and the first quantitative calculation model; and
[94] an environmentally sensitive factor analysis module 205, configured to analyze an environmentally sensitive factor in formation of a submarine step-like landform and a contribution of the environmentally sensitive factor according to the second quantitative calculation model.
[95] The first quantitative calculation model determination module 202 specifically includes:
[96] a first quantitative calculation model determination unit, configured to establish the first quantitative calculation model between the evolution process of the terrace topographic parameter and the environmental factor according to the migration change data: S1 ( ,y,t)+ Su,'(x,y,t)-D, ( , y,t)
[971 L,'(, y, t)
[98] where, X' Yrespectively represent a longitude and a latitude of a spatial position, 0 is a slope, tis a sea-level rise rate, Su,' is a basement subsidence rate, D,' is a vertical accretion or erosion rate of an islet, L,' is a lateral contraction rate of an E point, and t is evolutionary time.
[99] The parameter determination module 203 specifically includes:
[100] a topographic slope determination unit, configured to determine the topographic slope with a high-resolution multi-beam depth-sounding sonar system;
[101] a sea-level rise rate determination unit, configured to determine a sea-level rise rate according to a global sea-level curve;
[102] a basement subsidence rate determination unit, configured to determine a basement subsidence rate according to high-resolution seismic data;
[103] a vertical accretion or erosion rate determination unit, configured to determine the vertical accretion or erosion rate according to a sediment profile recovered by a core sample drill; and
[104] a lateral contraction rate determination unit, configured to determine the lateral contraction rate according to a seismic stratigraphic texture as well as a spatial range of retrogradation or progradation recorded in a topographic water-depth distribution. ) [105] Each embodiment of the present specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts between the embodiments may refer to each other. Since the system disclosed in the embodiments corresponds to the method disclosed in the embodiments, the description is relatively simple, and reference can be made to the method description.
[106] In this specification, several specific embodiments are used for illustration of the principles and implementations of the present disclosure. The description of the foregoing embodiments is used to help illustrate the method of the present disclosure and the core ideas thereof. In addition, those of ordinary skill in the art can make various modifications in terms of specific implementations and the scope of application in accordance with the ideas of the present disclosure. In conclusion, the content of the specification should not be construed as a limitation to the present disclosure.
Claims (5)
1. A method for quantitatively analyzing an evolution of a submarine step-like landform, comprising: acquiring migration change data of a spatial position of a terrace edge point over time; establishing a first quantitative calculation model between an evolution process of a terrace topographic parameter and an environmental factor according to the migration change data; determining parameters of the first quantitative calculation model, the parameters comprising a topographic slope, a sea-level rise rate, a basement subsidence rate, a vertical accretion or erosion rate and a lateral contraction rate; obtaining a second quantitative calculation model according to the parameters and the first quantitative calculation model; and analyzing an environmentally sensitive factor in formation of a submarine step-like landform and a contribution of the environmentally sensitive factor according to the second quantitative calculation model.
2. The method for quantitatively analyzing an evolution of a submarine step-like landform according to claim 1, wherein the migration change data comprises a water depth, a sea-level rise value, a sea-level subsidence amount, an initial edge point position, an evolved edge point position, a vertical distance between the initial edge point position and the evolved edge point position, and a horizontal distance between the initial edge point position and the evolved edge point position; wherein the establishing a first quantitative calculation model between an evolution process of a terrace topographic parameter and an environmental factor according to the migration change data specifically comprises: establishing the first quantitative calculation model between the evolution process of the terrace topographic parameter and the environmental factor according to the migration change data: - A (,y,t)+ Su,'(x, y,t)-D, ( ,y,t) tancPx~y)L,'(x,y,t) tanoLx y)=,
wherein, l'y respectively represent a longitude and a latitude of a spatial position, 0 is a SI'iae-ee Su' D'. slope, t is a sea-level rise rate, ' is a basement subsidence rate, ' is a vertical accretion or erosion rate of an islet, L,' is a lateral contraction rate of an E point, and t is evolutionary time; wherein the determining parameters of the first quantitative calculation model, the parameters comprising a topographic slope, a sea-level rise rate, a basement subsidence rate, a vertical accretion or erosion rate and a lateral contraction rate, specifically comprises: determining the topographic slope with a high-resolution multi-beam depth-sounding sonar system; determining the sea-level rise rate according to a global sea-level curve; determining the basement subsidence rate according to high-resolution seismic data; determining the vertical accretion or erosion rate according to a sediment profile recovered by a core sample drill; and determining the lateral contraction rate according to a seismic stratigraphic texture as well as a spatial range of retrogradation or progradation recorded in a topographic water-depth distribution.
3. A system for quantitatively analyzing an evolution of a submarine step-like landform comprises: a migration change data determination module, configured to acquire migration change data of a spatial position of a terrace edge point over time; a first quantitative calculation model determination module, configured to establish a first quantitative calculation model between an evolution process of a terrace topographic parameter and an environmental factor according to the migration change data; a parameter determination module, configured to determine parameters of the first quantitative calculation model, the parameters comprising a topographic slope, a sea-level rise rate, a basement subsidence rate, a vertical accretion or erosion rate and a lateral contraction rate; a second quantitative calculation model determination module, configured to obtain a second quantitative calculation model according to the parameters and the first quantitative calculation model; and an environmentally sensitive factor analysis module, configured to analyze an environmentally sensitive factor in formation of a submarine step-like landform and a contribution of the environmentally sensitive factor according to the second quantitative calculation model.
4. The system for quantitatively analyzing an evolution of a submarine step-like landform according to claim 3, wherein the migration change data comprises a water depth, a sea-level rise value, a sea-level subsidence amount, an initial edge point position, an evolved edge point position, a vertical distance between the initial edge point position and the evolved edge point position, and a horizontal distance between the initial edge point position and the evolved edge point position.
5. The system for quantitatively analyzing an evolution of a submarine step-like landform according to claim 3, wherein the first quantitative calculation model determination module specifically comprises: a first quantitative calculation model determination unit, configured to establish the first quantitative calculation model between the evolution process of the terrace topographic parameter and the environmental factor according to the migration change data: tan$(x,y)- S (ty,t)+ Su,'(x, y,t)-D, (i,y,t) )~L tanx y)=0 L,'(x,y,t) wherein, ly respectively represent a longitude and a latitude of a spatial position, 0 is a sasa-evlSu D'. slope, t is a sea-level rise rate, ' is a basement subsidence rate, ' is a vertical accretion or erosion rate of an islet, L,' is a lateral contraction rate of an E point, and t is evolutionary time; wherein the parameter determination module specifically comprises: a topographic slope determination unit, configured to determine the topographic slope with a high-resolution multi-beam depth-sounding sonar system; a sea-level rise rate determination unit, configured to determine a sea-level rise rate according to a global sea-level curve; a basement subsidence rate determination unit, configured to determine a basement subsidence rate according to high-resolution seismic data; a vertical accretion or erosion rate determination unit, configured to determine the vertical accretion or erosion rate according to a sediment profile recovered by a core sample drill; and a lateral contraction rate determination unit, configured to determine the lateral contraction rate according to a seismic stratigraphic texture as well as a spatial range of retrogradation or progradation recorded in a topographic water-depth distribution.
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