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Numerical experiment of land cover conversion effect on dissolved iron productivity of the Amur River Basinстатья
- Авторы: Onishi T., Yoh M., Shibata H., Nagao S., Kawahigashi M., Shamov V.V.
- Сборник: //Proc of the International Scientific Conference "Land cover and land use changes in North East Asia: problems of sustainable nature management". September 6-12, 2009, Vladivostok
- Год издания: 2009
- Место издания: DALNAUKA VLADIVOSTOK
- Первая страница: 118
- Последняя страница: 123
- Аннотация: In this report, we first discussed about the characteristics of seasonal and inter-annual fluctuation of dissolved iron concentration in the Amur River basin. Through the analysis of long-term iron concentration change at the Khabarovsk station, drastic increase during the period from 1996 to 1998 was found. Possible causes such as precipitation and agricultural activities were analyzed. However, mechanism of dissolved iron increase is not yet proved. Next, structure of hydrological model which incorporates dissolved iron production mechanism was explained. And some simulated results were shown. Seasonal change of discharge at Khabarovsk station is relatively well simulated. However, peak discharge in summer time was underestimated and timing of the peak was obviously fast. If we looked into the detail of spatial variation of discharge, discharge of the Songhua River was underestimated. In addition, hydrological and chemical processes which must be incorporated into the model were discussed. From the analysis of spatial variation of dissolved iron concentration during the period from 1992 to 1998, increasing trend of dissolved iron concentration was commonly observed. Thus, the increase of dissolved iron must have some relation to the large scale phenomena such as precipitation and temperature. Regression analysis between iron concentration and climate parameters is a future research task. Related to the model, first, optimization of hydrological parameters to improve the predicting accuracy of flood peak discharge amount in summer time is needed. Second, progress of redox process and flooding process must be incorporated into the model.
- Добавил в систему: Шамов Владимир Владимирович