Method for monitoring particle size distribution of suspended sediment in water

Abstract

The invention provides a method for monitoring particle size distribution of suspended sediment in water. The method comprises the following steps: (1) acquiring off-water remote-sensing reflectance of an inspection area and inverting a CDOM (Colored Dissolved Organic Matter) absorption coefficient of the inspection area according to the off-water remote-sensing reflectance; (2) inverting chlorophyll concentration of alga in the inspection area according to the off-water remote-sensing reflectance; (3) calculating a chlorophyll absorption coefficient and a chlorophyll backscattering coefficient according to the chlorophyll concentration; (4) analyzing mineral compositions in the suspended sediment, acquiring the particle diameter and complex refractive index of minerals, and calculating the backscattering coefficient and absorption coefficient of mineral grains via the relationship between the off-water remote-sensing reflectance and the backscattering coefficient and absorption coefficient of the mineral grains in Mie theoretical formula; and (5) constructing an ill conditioned equation according to the backscattering coefficient and absorption coefficient of the mineral grains and the off-water remote-sensing reflectance and acquiring information about the particle size distribution of the minerals.

Description

technical field [0001] The invention relates to the technical field of water color remote sensing, in particular to a method for monitoring particle size distribution of suspended sediment in a water body Background technique [0002] Sediment transport is an important hydrological phenomenon in rivers. It has a significant impact on river changes and is of great significance for understanding hydrodynamic environment and seawater material transport. In addition, suspended sediment will have adverse effects on plankton, marine fishery resources, aquaculture production, and resource protection areas. It is an important indicator for monitoring marine water quality and an important parameter for studying marine ecosystems and marine biogeochemical processes. Therefore, the monitoring of suspended sediment in water has very important practical significance and scientific research value. [0003] Routine monitoring often adopts two methods: experimental analysis after point-by-...

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Problems solved by technology

However, the above two methods are limited by factors such as manpower, equipment, hydrology, and climate, and cannot quickly extract the particle size distribution information of suspended sediment in water bodies in a large area. However, based on satellite remote sensing monitoring technology, higher spatial resolution can be quickly obtained. Therefore, remote sensing monitoring technology has become an important means of measuring suspended sediment particle size data in water bodies.

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