Mechanisms of initial crater morphology impacting lunar surface degradation: A finite element modeling study

MU Xiyao; HU Caibo; ZENG Xingguo; SHI Yaolin

doi:10.7523/j.ucas.2026.017

Journal of University of Chinese Academy of Sciences >

2026 2026017

DOI: https://doi.org/10.7523/j.ucas.2026.017

Mechanisms of initial crater morphology impacting lunar surface degradation: A finite element modeling study

MU Xiyao ,
HU Caibo ,
ZENG Xingguo ,
SHI Yaolin

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1. National Key Laboratory of Earth System Numerical Modeling and Application, College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 101408;
2. The Key Laboratory of Computational Geodynamics, Chinese Academy of Sciences, Beijing 100049;
3. The National Astronomical Observatories of the Chinese Academy of Sciences, Beijing 100101

Received date: 2026-01-16

Revised date: 2026-04-07

Online published: 2026-04-07

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Abstract

The unique environmental features of the lunar surface, characterized by the absence of atmosphere and aqueous erosion, provide an ideal setting for studying crater evolution. Based on topographic diffusion theory, this study constructs 1D axisymmetric ideal models and 2D models constrained by real topography to systematically clarify the dynamic control mechanisms of initial geometric parameters on crater morphological degradation. By establishing 800-meter-diameter crater profiles with three typical initial morphologies: flat crater floor, sharp crater rim, and gently sloped crater rim, we quantitatively characterize their morphometric decay over a 3-billion-year evolutionary cycle. The flat-floor model exhibits maximum cumulative floor subsidence of 88.7 meters, the sharp-rim model shows the highest rim expansion rate, while the gently-sloped-rim model maintains optimal morphological stability. Two-dimensional simulations using a 1.5-meter-resolution digital elevation model (DEM) reveal characteristic processes including rim rounding, mass wasting, and floor deposition, with representative craters displaying up to 50-meter depth reduction after 3 billion years. Comparative model dimensionality analysis demonstrates strong consistency in morphometric parameters between 1D and 2D models during the initial 200 million years. Beyond this period, transverse diffusion-dominated erosion-deposition coupling mechanisms result in more significant crater depth reduction in two-dimensional models compared to their one-dimensional models. Impact craters with diameters below 200 meters completely degrade into low-relief terrain after 3 billion years, introducing omission risks in crater size-frequency distribution (CSFD) chronology for ancient lunar terrains. Through multidimensional modeling and real-terrain validation, this research establishes novel dynamic constraints for refining lunar crater chronological frameworks and optimizing engineering site selection.

Key words： lunar crater; lunar landscape degradation; finite element simulation; crater chronology; high-performance numerical simulation

Cite this article

MU Xiyao , HU Caibo , ZENG Xingguo , SHI Yaolin . Mechanisms of initial crater morphology impacting lunar surface degradation: A finite element modeling study[J]. Journal of University of Chinese Academy of Sciences, 2026 : 2026017 . DOI: 10.7523/j.ucas.2026.017

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