KAKADU is at risk of radioactive contamination as climate change raises sea levels and causes more intense cyclones near the Ranger uranium mine, a report said. 

More than 70 per cent of Kakadu's wetlands are expected to be flooded by rising sea levels by 2050 -- killing fresh water plants and animals. 

The Top End is also expected to face more intense cyclones and heat waves that can melt roads. 

Charles Darwin University researcher Anna Boustead contributed to the national report on the impact of climate change on tourism destinations -- due to be released within months. 

The Ranger uranium mine produces radioactive by-products that are stored in a tailings dam. But as the Top End suffers more intense cyclones, Ms Boustead said there was a greater likelihood that radioactive material could enter Magela Creek and the East Alligator River. 

"It's a managed risk at the moment but, as Kakadu suffers more extreme flooding events, the limitations they have will increase,'' she said. 

A senate committee hearing also heard last month that more than 100,000 litres of contaminated water from the tailings dam was leaking into the ground beneath the park every day. 

Acting supervising scientist for the Alligator Rivers region David Jones said the seepage did not pose a threat to the surrounding environment. 

Dr Jones said any proposal for water storage at the mine had to take ``extreme events'' -- such as cyclones -- into account.