CH Conservation & Sustainability 3

Question 1

Which hydrographic survey application directly supports sustainable fisheries management?

Accepted Answer

Mapping essential fish habitat such as spawning grounds and reef structures

Answer

Habitat mapping identifies critical spawning and nursery areas, enabling managers to set fishing restrictions that sustain fish populations.

Question 2

When calculating a water budget for a watershed, which component represents the primary output in a humid temperate climate?

Accepted Answer

Evapotranspiration

Answer

In humid temperate regions, evapotranspiration typically accounts for the largest fraction of water budget outputs, often exceeding runoff.

Question 3

A hydrographer is asked to assess potential impacts of a proposed port expansion on tidal wetlands. Which dataset is most essential?

Accepted Answer

High-resolution bathymetric and topographic surveys of the intertidal zone

Answer

Intertidal bathymetric/topographic data defines wetland extent, elevation, and connectivity, which are critical for assessing dredging and fill impacts.

Question 4

What is the ecological significance of maintaining longitudinal connectivity in river systems?

Accepted Answer

It enables fish migration, sediment transport, and nutrient cycling along the river continuum

Answer

Longitudinal connectivity supports fish passage to spawning grounds, natural sediment routing, and downstream nutrient delivery essential to aquatic ecosystems.

Question 5

Which survey technique is most appropriate for monitoring long-term changes in a coral reef ecosystem with minimal environmental impact?

Accepted Answer

Airborne lidar bathymetry combined with hyperspectral imagery

Answer

Airborne lidar and hyperspectral remote sensing provide repeat large-area coverage without physical contact, making them ideal for sensitive reef monitoring.

(CH) Certified Hydrographer Practice Test

(CH) Certified Hydrographer Practice Test

CH Conservation & Sustainability 3