The Oasis Effect

SCI 6522 Subject & Catalog Number

Description

In some of the world’s driest regions, a small amount of water can have effects that are completely out of proportion to its volume. Meteorologists call this the “oasis effect”: a patch of land, surrounded by desert, that cools and moistens the air around it and maintains a microclimate that would not otherwise be possible. This seminar broadens the term to encompass a wider family of phenomena: configurations of topography, water, soil, vegetation, and built form that collect scarce water rather than add more. The disproportion is not accidental. Where the gradient between wet and dry is steepest, small additions of water can push a site across thresholds beyond which life becomes possible. Once those thresholds are crossed, a virtuous cycle begins in which the abundance of vegetation, living soil, and water leads to a greater presence of the others. Understood in this way, oases are not natural phenomena that spring from the sand, but rather designed environments: agricultural and architectural systems that resist—and at times reverse—the entropic tendency of arid lands.

The seminar will examine techniques through which different cultures have achieved such effects under conditions of water stress: the qanats of the Iranian plateau and the windcatcher-cooled cisterns of Yazd, the stepwells of Gujarat and Rajasthan, the ghouts of the Algerian Souf, the khadins of the Thar Desert, the enarenados and aljibes of Lanzarote, the amunas and cochas of the Andes, and the fog-fed hills of the Peruvian coast. Many of these techniques are centuries old and are based on knowledge passed down through practice. Today, some are threatened by aquifer depletion, extraction, and climate change.

The seminar will not treat these landscapes and buildings as relics of the past, but rather as an active, present-day archive of different ways to transform existing environmental conditions into desired ones. We will interpret them as thermodynamic systems: material configurations that alter how energy flows across a given site. Gravity, solar radiation, and wind determine how water behaves. The devices we will study—from terraces and channels to cisterns, courtyards, and towers—intervene in these conditions to slow, redirect, store, or reveal water. This work will be accompanied by readings on geomorphology, ecology, thermodynamics, information theory, and the history of agroecology and vernacular architecture.

Each student will choose a technique and explore it graphically through drawings and models representing the site, whether a building or a watershed, before and after human intervention. Earth, water, air, fire, and life will serve as analytical categories. The drawings will make visible not only matter but also energy: flows, gradients, accumulations, and the feedback loops that human intervention sets in motion. Collectively, the class will produce a comparative atlas covering the widest possible range of water-stressed conditions, from hot deserts to cold ones, and from coastal fog belts to high plateaus.

Students will be evaluated on their graphic research and their contribution to class discussions. Strong drawing skills are recommended.