W8 - Saltwater intrusion

Multiple Choice

Which statement accurately describes the impact of seawater intrusion (SWI) on coastal aquifers in Australia?

• A) SWI is primarily observed in regions with high agricultural activity.

• B) SWI can be fully reversed through effective groundwater management.

• C) SWI is solely caused by over-extraction of groundwater resources.

• D) SWI poses a threat to water quality and ecosystems in affected areas.

Multiple Choice

How do the vertical salinity profiles in the coastal aquifers of Koo Wee Rup reflect the interaction between historical and contemporary environmental changes?

• A) They demonstrate a consistent increase in salinity over time.

• B) They indicate a reversal in groundwater flow patterns.

• C) They reveal layers of saline water overlaying fresher groundwater and vice versa.

• D) They show a decrease in salinity with depth due to modern seawater intrusion.

Multiple Choice

Which factor could exacerbate seawater intrusion (SWI) in Australian coastal aquifers?

• A) Reduced industrial use of groundwater

• B) Increased population density

• C) Enhanced aquifer recharge rates

• D) Higher-than-average rainfall

Multiple Choice

Why has seawater intrusion (SWI) not yet become widespread across Australia's coastal regions?

• A) Limited availability of groundwater resources

• B) Robust management practices in place

• C) Short history of groundwater exploitation

• D) High levels of precipitation along the coast

Multiple Choice

What is a key application of radiocarbon dating in the context of groundwater aging?

• A) Determining the mineral composition of groundwater samples

• B) Differentiating between recent seawater intrusion and older saline water

• C) Measuring the pH levels of groundwater sources

• D) Estimating the volume of water present in aquifers

Multiple Choice

In radiocarbon dating analysis, what does the term "pMC" represent, and what is the approximate age indicated for a sample showing 50 pMC?

• A) Percentage of Modern Carbon; 5,730 years

• B) Past Material Content; 5,730 years

• C) Percentage of Modern Carbon; 50 years

• D) Particle Mass Concentration; 5,730 years