A method for inversion of freshwater assurance rate along estuaries

Abstract

The invention discloses a method for inversion of freshwater assurance rate along estuaries, which comprises the following steps: according to the historical freshwater runoff and tidal level data ofthe estuary, obtaining the runoff distribution function influenced by artificial water intake; B. establishing a runoff-tide level two-dimensional joint distribution and joint risk probability model;C. constructing a three-dimensional hydrodynamic and salinity mathematical model based on the topography measure in the estuary; D, based on the three-dimensional hydrodynamic and salinity mathematical model obtained in the step C, simulating the saline water intrusion by item combination of runoff and tidal level to obtain a runoff and tidal level interval, namely a freshwater guaranteed area, inwhich the saline water intrusion does not occur in each river section; E. calculating the assurance rate of freshwater along the estuary along the saltwater intrusion based on the step B and the stepD; F. according to the assurance rate of freshwater along the estuary obtained in the step E, obtaining the critical water intake cross section under different water intake scales. The invention hasthe advantages of providing a salt water intrusion risk assessment method and realizing accurate quantification of the freshwater guarantee rate along the estuary.

Description

technical field [0001] The invention relates to the field of utilization of estuary fresh water resources, in particular to an inversion method for fresh water guarantee rate along the estuary. Background technique [0002] With the development of social economy, water resources are becoming more and more important resources for all walks of life. The river estuary area is often affected by salt water intrusion. The salinity of the water body affects the river and wetland ecosystem, and also affects the development and utilization of human water resources. Many large cities and population settlements are located in estuary areas, where fresh water resources are very important. Due to the impact of salt water intrusion, the selection of water intake scale and location of water intake points at river estuaries has an important impact on drinking water safety and social and economic development. [0003] The salinity of estuaries is under the joint action of hydrological facto...

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Problems solved by technology

[0004] However, compared with the runoff and tidal level measurement series, it is very difficult to measure the salinity of the entire river estuary on-site. The long-term salinity measurement data of the estuary is often very lacking, which makes it difficult to assess the risk of saltwater intrusion in the estuary, let alone rationalize the water intake. Sure

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