22 papers
Spall Failure of Coral Skeleton beneath Gas-Laden Canopies: An Idealized Blast-Fishing Model
Sandy Hardian Susanto Herho, Agus Wahyu Jatmiko, Rizki Dimas Permana +7
Improvised explosives used for fishing on shallow Indonesian reefs shatter coral skeleton, yet the damage they cause has been described largely through empirical radii and ecologic…
Conservation Constraints and Distributed Advective Memory in a Reduced Model of Atlantic Overturning Hysteresis
Sandy Hardian Susanto Herho, Iwan Pramesti Anwar, Mutiara Rachmat Putri +3
Interbasin exchange through the Indo-Pacific gateway supplies salt to the Atlantic and is widely invoked as a control on the stability of the Atlantic overturning circulation. We a…
An Exactly Solvable Ekman Layer with a Fractional-Order Stress Closure
Sandy Hardian Susanto Herho, Rizki Dimas Permana, Iwan Pramesti Anwar +3
The classical theory of the wind-driven surface layer of a rotating ocean closes the momentum balance with a local flux-gradient law, in which the turbulent stress at a given depth…
A Reduced-Order Dynamical Model for the Ignition of Diver-Induced Cohesive Silt-Out on Sloping Beds
Sandy Hardian Susanto Herho, Iwan Pramesti Anwar, Umar Abdurrahman +4
A downward fin thrust near a cohesive seabed lofts sediment. Whether this cloud settles or organizes into a self-sustaining down-slope current determines if a diver loses visibilit…
An Idealized Delay-Differential Model of Scuba Diver Porpoising and Runaway Ascent
Sandy Hardian Susanto Herho, Faizal Ade Rahmahuddin Abdullah, Iwan Pramesti Anwar +5
A scuba diver holding constant depth balances on an unstable equilibrium: the gas carried in the suit and buoyancy compensator compresses with depth, so the buoyant force falls as…
anyakrakusuma: A Python Library for Entropic Schrödinger Bridges on Idealized Geometries
Dasapta Erwin Irawan, Sandy Hardian Susanto Herho, Agus Wahyu Jatmiko +7
We present anyakrakusuma, an open-source Python library that solves the discrete static Schrödinger bridge problem, the entropically regularized counterpart of optimal transport, t…
amerta: A Python Library for Idealized 1D Saint--Venant Dam-Break Simulation
Dasapta E. Irawan, Sandy H. S. Herho, Iwan P. Anwar +6
The Saint-Venant shallow water equations (SWE) govern depth-integrated free-surface flows arising in dam-break inundation, flood routing, tsunami runup, and estuarine tidal dynamic…
Preliminary sonification of ENSO using traditional Javanese gamelan scales
Sandy Hardian Susanto Herho, Rusmawan Suwarman, Nurjanna Joko Trilaksono +2
Sonification -- the mapping of data to non-speech audio -- offers an underexplored channel for representing complex dynamical systems. We treat El Niño-Southern Oscillation (ENSO),…
Three-Dimensional Variational Data Assimilation with Rapid Update Cycling for Short-Range Precipitation Forecasting: A Case Study of Heavy Rainfall in Bali, Indonesia
Nurjanna Joko Trilaksono, Sandy Hardian Susanto Herho, I Putu Ferry Wistika +3
This study evaluates the effectiveness of three-dimensional variational (3D-Var) data assimilation coupled with a Rapid Update Cycle (RUC) framework for improving short-range preci…
Causal Attribution of Coastal Water Clarity Degradation to Nickel Processing Expansion at the Indonesia Morowali Industrial Park, Sulawesi
Sandy Hardian Susanto Herho, Alfita Puspa Handayani, Iwan Pramesti Anwar +5
Indonesia's nickel ore export ban has driven rapid expansion of smelting and hydrometallurgical processing capacity at the Indonesia Morowali Industrial Park (IMIP), now the world'…
Measuring Primitive Accumulation: An Information-Theoretic Approach to Capitalist Enclosure in PIK2, Indonesia
Sandy Hardian Susanto Herho, Alfita Puspa Handayani, Karina Aprilia Sujatmiko +5
Large-scale land enclosure for speculative mega-development constitutes a non-equilibrium spatial process whose velocity, topology, and irreversibility remain poorly quantified. We…
An Open-Source Pseudo-Spectral Solver for Idealized Korteweg-de Vries Soliton Simulations
Dasapta E. Irawan, Sandy H. S. Herho, Faruq Khadami +5
The Korteweg-de Vries (KdV) equation governs the propagation of nonlinear internal and surface gravity waves in shallow ocean environments, where the balance between nonlinear stee…
dewi-kadita: A Python Library for Idealized Fish Schooling Simulation with Entropy-Based Diagnostics
Sandy H. S. Herho, Iwan P. Anwar, Faruq Khadami +5
Collective motion in fish schools exemplifies emergent self-organization in active matter systems, yet computational tools for simulating and analyzing these dynamics remain fragme…
Numba-Accelerated 2D Diffusion-Limited Aggregation: Implementation and Fractal Characterization
Sandy H. S. Herho, Faiz R. Fajary, Iwan P. Anwar +4
We present dla-ideal-solver, a high-performance framework for simulating two-dimensional Diffusion-Limited Aggregation (DLA) using Numba-accelerated Python. By leveraging just-in-t…
amangkurat: A Python Library for Symplectic Pseudo-Spectral Solution of the Idealized (1+1)D Nonlinear Klein-Gordon Equation
Sandy H. S. Herho, Siti N. Kaban
This study introduces amangkurat, an open-source Python library designed for the robust numerical simulation of relativistic scalar field dynamics governed by the nonlinear Klein-G…
1d-qt-ideal-solver: 1D Idealized Quantum Tunneling Solver with Absorbing Boundaries
Sandy Hardian Susanto Herho, Sito Fossy Biosa, Siti Nurzannah Kaban +4
We present 1d-qt-ideal-solver, an open-source Python library for simulating one-dimensional quantum tunneling dynamics under idealized coherent conditions. The solver implements th…
kh2d-solver: A Python Library for Idealized Two-Dimensional Incompressible Kelvin-Helmholtz Instability
Sandy H. S. Herho, Nurjanna J. Trilaksono, Faiz R. Fajary +4
We present an open-source Python library for simulating two-dimensional incompressible Kelvin-Helmholtz instabilities in stratified shear flows. The solver employs a fractional-ste…
\texttt{simple-idealized-1d-nlse}: Pseudo-Spectral Solver for the 1D Nonlinear Schrödinger Equation
Sandy H. S. Herho, Iwan P. Anwar, Faruq Khadami +2
We present an open-source Python implementation of an idealized high-order pseudo-spectral solver for the one-dimensional nonlinear Schrödinger equation (NLSE). The solver combines…
rd-spiral: An open-source Python library for learning 2D reaction-diffusion dynamics through pseudo-spectral method
Sandy H. S. Herho, Iwan P. Anwar, Rusmawan Suwarman
We introduce rd-spiral, an open-source Python library for simulating 2D reaction-diffusion systems using pseudo-spectral methods. The framework combines FFT-based spatial discretiz…
100-Day Analysis of USD/IDR Exchange Rate Dynamics Around the 2025 U.S. Presidential Inauguration
Sandy H. S. Herho, Siti N. Kaban, Cahya Nugraha
Using a 100-day symmetric window around the January 2025 U.S. presidential inauguration, non-parametric statistical methods with bootstrap resampling (10,000 iterations) analyze di…
An Early Development of Flood Inundation Mapping Method Using Free Android Application to Support Emergency Response Activities: Case Study Baleendah, Bandung, West Java
Sandy Hardian Susanto Herho, Edi Riawan, Cahya Nugraha +3
This study aims to simplify the current flood mapping methodology, so it can be done in quicker time, easy to learn, but still produce accurate flood information to support the eme…
Mapping groundwater potential zones in Cilongok Area, Banyumas, Central Java using 2D geoelectrical resistivity
Sandy Hardian Susanto Herho, Plato Martuani Siregar, Iqbal Syarief +2
The aim of this study is to investigate the presence of potential aquifer layers that would be used as a source of clean water for residents in Cilongok sub-district. We conducted…