CH Conservation & Sustainability 3 — Questions and Answers
Question 1: Which hydrographic survey application directly supports sustainable fisheries management?
- Mapping essential fish habitat such as spawning grounds and reef structures (Correct answer)
- Measuring salinity at a single fixed station
- Charting commercial shipping lanes only
- Documenting vessel fuel consumption during surveys
Correct answer: Mapping essential fish habitat such as spawning grounds and reef structures
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?
- Infiltration to deep aquifers
- Streamflow (runoff)
- Evapotranspiration (Correct answer)
- Direct precipitation reuse
Correct answer: Evapotranspiration
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?
- Tide gauge records from distant offshore stations
- High-resolution bathymetric and topographic surveys of the intertidal zone (Correct answer)
- Historical shipping manifests from the port
- Atmospheric pressure records from the nearest airport
Correct answer: High-resolution bathymetric and topographic surveys of the intertidal zone
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?
- It allows barges to pass without locks
- It enables fish migration, sediment transport, and nutrient cycling along the river continuum (Correct answer)
- It increases water velocity for hydropower generation
- It reduces the cost of stream gauge installation
Correct answer: It enables fish migration, sediment transport, and nutrient cycling along the river continuum
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?
- Repeated mechanical dredging transects
- Airborne lidar bathymetry combined with hyperspectral imagery (Correct answer)
- Installation of permanent anchor buoys for survey vessels
- Manual tape-measure transects by SCUBA divers monthly
Correct answer: Airborne lidar bathymetry combined with hyperspectral imagery
Airborne lidar and hyperspectral remote sensing provide repeat large-area coverage without physical contact, making them ideal for sensitive reef monitoring.
Question 6: In the context of sea-level rise adaptation, what does 'managed coastal retreat' involve hydrographically?
- Constructing larger seawalls seaward of existing ones
- Monitoring shoreline position and inundation extent to support planned landward relocation of infrastructure (Correct answer)
- Dredging offshore to lower sea level locally
- Installing tidal barriers at all river mouths
Correct answer: Monitoring shoreline position and inundation extent to support planned landward relocation of infrastructure
Hydrographic monitoring of shoreline change and inundation informs decisions about strategically relocating assets rather than defending them in place.
Question 7: Which international framework specifically guides nations in sustainable management of freshwater resources through integrated water resources management (IWRM)?
- MARPOL 73/78
- The Dublin Principles and GWP IWRM framework (Correct answer)
- SOLAS Convention
- Basel Convention on Hazardous Wastes
Correct answer: The Dublin Principles and GWP IWRM framework
The 1992 Dublin Principles and the Global Water Partnership's IWRM framework provide the internationally recognized approach for coordinated freshwater governance.
CH Conservation & Sustainability 3
Which hydrographic survey application directly supports sustainable fisheries management?