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Method for calculating watershed non-point source phosphorus pollution in-river coefficient in combination with sediments and models

A technology for sediment and phosphorus pollution, applied in the field of watershed non-point source pollution assessment and management, can solve the problems of numerous parameters, high data requirements, and difficulty in wide-scale promotion, and achieve accurate results

Active Publication Date: 2018-11-06
BEIJING NORMAL UNIVERSITY
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Problems solved by technology

Model simulation has the advantage of accurate results, but it is difficult to popularize it on a large scale due to high data requirements, numerous parameters, and difficult calibration

Method used

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  • Method for calculating watershed non-point source phosphorus pollution in-river coefficient in combination with sediments and models
  • Method for calculating watershed non-point source phosphorus pollution in-river coefficient in combination with sediments and models
  • Method for calculating watershed non-point source phosphorus pollution in-river coefficient in combination with sediments and models

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Embodiment Construction

[0056] The present invention is a new method for calculating the river basin non-point source phosphorus pollution inflow coefficient based on the combination of sediment and model simulation. The specific steps are as follows:

[0057] step one:

[0058] This case selects the Abujiao River Basin, a typical agricultural small watershed located in Bawujiu Farm in Northeast China, as a case study. Landsat TM data was interpreted by remote sensing to obtain land use data of the study area in 1979, 1992, 2000, 2005 and 2010. Soil property data were extracted from the National Soil Database and updated through field experiments. Meteorological data are obtained from local weather stations, including rainfall, maximum temperature, minimum temperature, relative humidity, wind speed, and sunshine hours. Agricultural management measures in the study area, such as agricultural production status, fertilization conditions, irrigation and drainage methods, fertilization amount, etc., are...

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Abstract

The present invention relates to a method for calculating a watershed non-point source phosphorus pollution in-river coefficient in combination with sediments and models. The method comprises: Step 1:simulating the agricultural non-point source phosphorus pollution generated load in a typical small watershed; Step 2: collecting the sediments and measuring the total phosphorus deposition flux; andStep 3: establishing a relationship between the watershed non-point source phosphorus load and the phosphorus deposition flux, and calculating the in-river coefficient. The method disclosed by the present invention has the following advantages that: 1, by establishing the relationship between the watershed phosphorus generated load and the total phosphorus deposition flux in the typical small watershed, the formula can be applied to other similar watersheds for the calculation of the phosphorus pollution generated load and can be used for the calculation of the in-river coefficient; 2, afterthe calculation formula is established, in the application watershed, only by collecting the surface sediments for measuring and mastering the phosphorus load data in the exit of the watershed can thenon-point source pollution in-river coefficient of the watershed in the current year be calculated, and the implementation is simple and easy; and 3, in combination with sediment experiments, model simulations and actual monitoring data, the results are relatively accurate.

Description

【Technical field】 [0001] The invention belongs to the technical field of evaluation and management of watershed non-point source pollution, and relates to a calculation method for the river basin non-point source phosphorus pollution inflow coefficient, in particular to a calculation method for the watershed non-point source phosphorus pollution river inflow coefficient combined with sediment and a model. 【Background technique】 [0002] Under the condition that point source pollution is effectively controlled, agricultural non-point source has become the main source of contribution to water environment pollution, and has become the focus and difficulty of improving water environment quality. The generation and migration of non-point source pollution is a very complicated process. Due to the influence of factors such as hydrology, meteorology, regional location, and underlying surface conditions, there is a large gap between the production load of agricultural non-point source...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 欧阳威徐宜雪郝新杨万新何孟常
Owner BEIJING NORMAL UNIVERSITY
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