What is Submarine Groundwater Discharge? | AI Learning Guide

We often think of the ocean as a closed container, but water does move between land and sea. This movement is called Submarine Groundwater Discharge, or SGD. However, SGD is not the ocean draining away; it is the opposite. It is the process where groundwater, pushed by gravity and pressure from rainfall on land, flows underground and eventually exits directly into the ocean. So, the flow is strictly from land to sea.

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Definition of SGD

Submarine Groundwater Discharge (SGD) is the flow of groundwater from the land directly into the coastal ocean. It is a critical part of the hydrological cycle, acting as a bridge where terrestrial water meets the sea.

Direction of Flow

It is crucial to understand that SGD represents water leaving the land and entering the ocean. It is not the ocean draining into the ground. The hydraulic pressure from rain and runoff on land pushes water through the crust until it exits underwater.