UCLA Researchers Studied Death Valley Dune Recovery

A new study tracked how Hurricane Hilarys 2023 flood reshaped dunes in Death Valley National Park.

Updated on Sept. 28, 2026 in Geography

A wide expanse of wind-rippled sand dunes in Death Valley under long, golden-hour shadows. — UCLA researchers found that the 2023 flooding from Hurricane Hilary moved over 1 million tons of sand at Death Valley National Park. AI Illustration. Upload story photo >

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Is extreme weather causing more noticeable changes to your local environment than in the past?

UCLA researchers have published a study detailing how California's Mesquite Flat Sand Dunes recovered following the 2023 flooding caused by Hurricane Hilary. The storm delivered a full year of rain to Death Valley National Park in a single day, dramatically altering the landscape.

Why it matters

By analyzing how sediment deposits shift and recover, scientists can better interpret ancient climate records here on Earth and across the solar system. The findings help refine models for understanding surface changes on other planets.

Researchers utilized ground-level LiDAR to collect centimeter-level data, documenting that a flood-cut channel was partly filled within 65 days and nearly finished by December 2024.

The players

UCLA

This is a major public research university located in Los Angeles, California, that hosts significant geological and scientific departments.

Death Valley National Park

This is a United States national park that spans the border of California and Nevada and is known for its extreme climate and diverse desert geology.

The details

The intense rainfall triggered by Hurricane Hilary eroded 1.3 million tons of sand from one area, which was then redeposited as 1.5 million tons of new dunes downstream. Wind-blown sand eventually smoothed the terrain and refilled the channels, a process researchers captured using ground-based sensors due to drone restrictions.

Hurricane Hilary brought record-breaking rain to Death Valley in 2023.
A flood-cut channel was found to be partly filled 65 days after the storm.
The channel was almost completely filled by December 2024.
Researchers published their study findings on September 28, 2026.

Deeper Dive

This study's findings on sand dune movement follow a pattern set by the ongoing geomorphological research on Saturn's moon, Titan.

The study offers insights into how extreme weather may permanently alter desert landscapes that are popular with California residents and visitors. These findings provide a framework for scientists to better predict landscape shifts on Mars and other planetary bodies.

The takeaway

Understanding how quickly landscapes recover from extreme events can help scientists better manage resources in vulnerable desert regions. The data also helps researchers refine interpretations of geological records that are essential for planetary exploration.