CSSI traceability and real-time monitoring-based drainage basin river-entering sediment source load identification method

Abstract

The invention belongs to the technical field of agricultural non-point source pollution, and particularly relates to a drainage basin in-river sediment source load identification method based on CSSI traceability and real-time monitoring, comprising the following steps: S1, CSSI traceability tracing of a drainage basin in-river sediment land utilization source; s2, real-time monitoring of river sediment load of the drainage basin; and S3, determining river-entering sediment loads of different land utilization types of eroded soil in the drainage basin by jointly applying CSSI sediment traceability and real-time monitoring technologies. According to the method, the river sediment source load can be simply, comprehensively, accurately and quantitatively analyzed, a scientific basis is provided for water ecological management, and the sediment load input into rivers, lakes and reservoirs can be effectively prevented and controlled.

Description

technical field [0001] The invention belongs to the technical field of agricultural non-point source pollution, and in particular relates to a method for identifying source loads of river sediments in river basins based on CSSI traceability and real-time monitoring. Background technique [0002] Soil erosion caused by rainfall runoff is the main driving factor of surface soil and nutrient loss, which leads to soil degradation and threatens the sustainable development of agriculture. Accurately identifying the source of sediment and calculating the load of sediment entering the river are the prerequisites for effective prevention and control of sediment entering rivers and lakes. [0003] Currently, the compound-specific stable isotope (CSSI) technique can determine the percentage contribution of different land use types to river sediments. Its principle is to use the same fatty acids produced by different plants as biomarkers to mark the soil. Analysis of fatty acid stabili...

AI Technical Summary

Problems solved by technology

Therefore, the joint application of FRN and CSSI technology proposed by Yu Hanqing et al. (2020) to identify the contribution flux of different land use types to river and lake sediments lacks a theoretical basis.

[0006] (2) Problems in CSSI sampling: the sampling time is not clear; the sampling soil does not necessarily erode; the sediment samples collected at the low-lying places at the outlet of the watershed will not enter the water bodies of rivers and lakes

[0007] (3) Problems with river inflow load: river inflow load should include all sources of sediment in the catchment area, but the erosion estimated by FRN is limited to surface erosion and inter-rill erosion, excluding gully erosion

[0008] Therefore, the combination of FRN technology and CSSI tracer technology to determine the sediment source load of different land use types is not correct.

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