The applicability research of TVGM model in arid and semiarid watersheds of Liaoning Province
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Abstract:
Natural w atershed is a typical complex open sy stem, and the tempo2spatial v ariation of hydro lo gical elements is hig hly no nlinear especially in arid and semiarid w atersheds. Therefor e, focusing o n the no nlinear r elatio nship bet ween rainfall and r un2 o ff in arid and semiarid w atersheds, this paper applied the T ime Variant Gain Mo del ( TVGM ) , GR4J, To tal Linear Response Model( TLR) , and Linear Perturbation Model( LPM) to simulate the da ily str eamflow in Liaoning Prov ince, China. We compared the applicat ion effects o f the four mo dels in terms of tw o accuracy measures to investig ate the applicability of these four mo dels in the simulatio n o f rainfall and runoff in arid and semiarid w atersheds. The r esults show ed that the TVGM mo del w as the best cho ice, followed by the GR4J mo del, w hereas the tw o linear mo dels perfo rmed po orly in the hy dr olog ical simulat ion of arid and semi2arid w at ersheds in Liaoning Prov ince. T he TVGM mo del intr oduced the t ime v ariant gain factor and consider ed the key facto rs ( e. g . , w atershed wetness and rainfall intensity) of runo ff generatio n. It presented much mo re satisfying results t han the other mo dels during the calibratio n and validat ion perio ds. T his is the char acteristic and application value of T VGM model.
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