DeepFlows

Science beneath the surface

Water moves, even deep beneath the surface.

We share practical expertise in groundwater and geochemical modeling (MODFLOW, PHREEQC) for environmental and water resource assessment, along with data analysis using Python, AI, and Vibe Coding.
Exploring the world of water through science, code, and diverse perspectives—this is a platform to decipher natural phenomena from data.

SCIENCE · CODE · INSIGHT · WATER

Groundwater Geochemistry Hydrology AI & Python MODFLOW PHREEQC Geography Geothermal Science

☀️ Featured Series

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PHREEQC Tutorial

A complete guide to geochemical modeling, deciphering chemical reactions between water and rock. From installation to reaction path modeling.

Read in English

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Groundwater Modeling

Practical know-how for groundwater flow analysis and hydrothermal geochemical simulations using MODFLOW and FloPy.

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Introduction to Groundwater Science #2: Where Does Groundwater Exist and How Does It Move? — The Geological Container and Topographical Engine

Where does groundwater exist and how does it move? This article illustrates the geological ‘containers’ of groundwater—from alluvial aquifers and bedrock fractures to dynamic Karst topography. It also details Tóth’s groundwater flow systems, explaining how topography drives groundwater movement.

2026/06/03

Heejun Yang

Introduction to Groundwater Science #1: What is the Water Cycle? — Where Does the Rain Go?

Groundwater makes up 99% of the unfrozen freshwater on Earth. This article explains the fundamental mechanisms of the water cycle and the global water budget. Discover why groundwater is a uniquely vital resource and learn the basics of hydrology.

2026/06/02

Heejun Yang

PHREEQC from Scratch #15: Inverse Modeling — Deducing “Invisible Underground Processes” from Water Quality Data

Inverse modeling is the ultimate tool for unraveling “causes” from “results.” We unravel the mechanisms of groundwater-seawater mixing, cation exchange, and spring water evolution like a detective game.

2026/06/01

DeepFlow

Starting PHREEQC from Scratch (Advanced) #14: Groundwater Diagnosis of Nitrate Pollution - Where and How Much Denitrification Occurs

Diagnose and quantify nitrate pollution, the most frequent problem in agricultural groundwater, using Python. Learn the entire process from the concept to simulation and field diagnosis of how NO3- produced by nitrification moves and how it disappears via denitrification.

2026/05/29

DeepFlow

PHREEQC from Scratch #13: Redox Sequences — The Order of Groundwater Reduction

Reproducing redox sequences in PHREEQC, where electron acceptors are consumed in the order of O₂ → NO₃⁻ → Mn²⁺ → Fe²⁺ → SO₄²⁻ → CH₄ in an aquifer containing organic carbon. Calculating the classic Appelo & Postma diagram step by step.

2026/05/25

DeepFlow