Continental Shelf Profile Determination via Sediment and Sea Level Modeling
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Solution Overview
Problem
Existing methods for calculating continental shelf profiles are limited to small time scales and do not consider the effects of sediment supply from rivers and sea level rise, particularly in the context of non-delta transgression, where the coastline can move both landwards and seawards due to fluvial action.
Innovation Solution
A method and apparatus that construct a two-dimensional model of the continental shelf profile based on river sediment supply volume and sea level rise rate, solved in a spatial rectangular coordinate system to generate a relational expression representing non-delta transgression slope and river length, allowing for accurate determination of the profile change over historical periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the prior art method based on wave erosion and Bruun's rule is used to calculate the continental shelf profile, then the calculation is simple and applicable to small time scales, but it cannot be applied to large time scales of thousands to hundreds of thousands of years when external conditions change
Solution Approach 1:
The patent transforms the calculation approach by changing the fundamental parameters from wave erosion rates to river sediment supply volume and sea level rise rate. This parameter transformation enables the model to operate across different time scales by incorporating long-term climatic and geological factors that drive continental shelf evolution over thousands to hundreds of thousands of years
Solution Approach 2:
The patent introduces dynamic elements by allowing the continental shelf profile to evolve through the interaction of river sediment supply and sea level rise over time. The model dynamically adjusts the profile based on varying sediment supply rates and sea level changes, making it adaptable to different time scales and external conditions rather than assuming static equilibrium
2Device complexity
If the prior art method is used, then the calculation only considers wave erosion effects, but it does not consider the effects of river sediment supply on coastline movement
Solution Approach 1:
The patent merges two previously separate processes into a unified model: river sediment supply from land and sea level rise from ocean. By combining these factors, the model comprehensively determines continental shelf profile changes, capturing the interaction between fluvial sedimentation and marine transgression that jointly shape the coastline over geological time scales
Data Source
AI summary
The present disclosure provides a continental shelf profile determining method and apparatus based on non-delta transgression. The method includes: constructing a continental shelf profile two-dimensional model based on a river supply sediment volume and a sea level rise rate in a target work area; solving the two-dimensional model in a spatial rectangular coordinate system to generate a relational expression which is capable of representing a non-delta transgression slope and a river length; and determining a continental shelf profile of the target work area based on the relational expression. In the context of non-delta transgression, the continental shelf profile determining method and apparatus based on non-delta transgression provided by the present disclosure comprehensively consider the influences of a river sediment supply and a sea level rise on the continental shelf profile, to more accurately determine the change of the continental shelf profile of the target work area in the historical period.