Definition

1. Noun:
   • Stationary water level: The state of a body of water (such as in a river, lake, or sea during tide) when its surface is calm and its level is not rising or falling. This term often describes the brief, still moment at the turning point of a tide.
   • Slack water / Slack tide: The short period when the tide is neither coming in (flooding) nor going out (ebbing), and the water level appears stable.

Usage Examples

• Noun:
  • Thuyền bè có thể dễ dàng ra vào cảng trong giờ nước đứng. (Boats can easily enter and leave the port during slack water.)
  • Khi thủy triều đổi chiều sẽ có một khoảnh khắc nước đứng. (When the tide changes direction, there is a moment of stationary water level.)
  • Các ngư dân thường tranh thủ đánh bắt vào lúc nước đứng. (Fishermen often take advantage of fishing during slack tide.)

Advanced Usage

• Technical/Hydrological Context: In hydrology and marine navigation, "nước đứng" precisely indicates the moment of minimum current velocity during the tidal cycle.
  • Đo độ sâu kênh nên được thực hiện lúc nước đứng để có số liệu chính xác. (Channel depth measurements should be taken at slack water for accurate data.)

Variants and Related Words

• Nước lớn (n): High tide.
• Nước ròng (n): Low tide.
• Triều (n): Tide.
• Mực nước (n): Water level.

Synonyms

• Mực nước ổn định: Stable water level.
• Thời điểm nước nghỉ: The period of resting water.

Related Phrases

• Giờ nước đứng: Slack water time / Slack tide period.
  • Hãy kiểm tra lịch thủy triều để biết giờ nước đứng. (Check the tide table to know the slack water time.)

Related Idioms

(This specific term is technical and does not commonly appear in idiomatic expressions.)

1. Stationary water level