Airgun Soft-Start Reference

Return the purpose and project-specific nature of seismic-airgun ramp-up mitigation.

Description

A soft start or ramp-up begins with reduced acoustic output and increases it progressively to provide an opportunity for animals to move away.

A soft start or ramp-up begins with reduced acoustic output and increases it progressively to provide an opportunity for animals to move away. This reference explains the selected concept and the evidence needed to interpret it.^[1]

The returned values include Source, Statement, Topic. The How section below explains the calculation, input rules and interpretation.

When to use Airgun Soft-Start Reference

Use Airgun Soft-Start Reference when you need to evaluate the supplied records under the calculation and evidence rules below. Ramp-up is one mitigation element and does not establish absence of exposure or biological effect. This is an introductory excerpt, not the complete standard, a current compliance check or a project-specific calculation.

Choose the measured quantities, units, weighting and measurement basis before entering values. For a reference, select the exact topic. For a catalog lookup, prepare complete source-backed records; for a screen, select an applicable caller limit.

How to use Airgun Soft-Start Reference and understand its results

Choose the measured quantities, units, weighting and measurement basis before entering values. For a reference, select the exact topic. For a catalog lookup, prepare complete source-backed records; for a screen, select an applicable caller limit.
Enter topic using the field table and calculation rules, then run the tool.
Read source, statement, topic. The explanation below defines the units, signs, ordering and any flags or placeholder values.
If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.

Input field	Meaning	Value type; see rules below	Requirement
topic	Reference topic to return.	string; one of "purpose", "procedure", "caution"	Required

Choose one of the exact topic values in the table. The tool indexes a fixed, locally embedded reference entry and returns its source label, statement and unchanged topic. It does not fetch the source or update the wording. Topic meanings and all returned entries are shown below.

Selection	Returned reference entry
purpose	source: JNCC seismic survey guidelines and project permits; statement: A soft start or ramp-up begins with reduced acoustic output and increases it progressively to provide an opportunity for animals to move away.; topic: purpose
procedure	source: Applicable marine permit and mitigation plan; statement: Duration, source sequence, monitoring, delay, shutdown, and restart rules are jurisdiction- and permit-specific.; topic: procedure
caution	source: Marine environmental-assessment guidance; statement: Ramp-up is one mitigation element and does not establish absence of exposure or biological effect.; topic: caution

selected exact topic → embedded source label, explanatory statement and topic

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output field	Meaning	Value type
source	Source used for the reference statement.	string
statement	Narrow reference statement for the selected topic.	string
topic	Selected reference topic.	string; one of "purpose", "procedure", "caution"

json

{
  "input": {
    "topic": "purpose"
  },
  "output": {
    "source": "JNCC seismic survey guidelines and project permits",
    "statement": "A soft start or ramp-up begins with reduced acoustic output and increases it progressively to provide an opportunity for animals to move away.",
    "topic": "purpose"
  }
}

Limitations and assumptions

Ramp-up is one mitigation element and does not establish absence of exposure or biological effect. This is an introductory excerpt, not the complete standard, a current compliance check or a project-specific calculation.

Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Extremely large text inputs are rejected. Missing fields without a declared default, extra fields, wrong value types and violations of the calculation rules are input errors.

Alternative or Complementary methods

Use Marine Mammal Hearing Group Reference: Hearing groups organize species with broadly similar hearing sensitivity for frequency weighting and acoustic-exposure assessment. This reference explains the selected concept and the evidence needed to interpret it. For a complementary task, use Microphone Placement Reference: Microphone height and distance from façades or other reflecting surfaces must follow the stated measurement standard and assessment objective. This reference explains the selected concept and the evidence needed to interpret it.

References

Airgun Soft-Start Reference — tool.io

Similar or alternative tools

Marine Mammal Hearing Group Reference
Hearing groups organize species with broadly similar hearing sensitivity for frequency weighting and acoustic-exposure assessment. This reference explains the selected concept and the evidence needed to interpret it.
Microphone Placement Reference
Microphone height and distance from façades or other reflecting surfaces must follow the stated measurement standard and assessment objective. This reference explains the selected concept and the evidence needed to interpret it.