Skip to Main Content

The resulting rainfall events are shown in Table 3 with an average total amount of 90.4 mm, indicating that the conditions are optimal for the antecedent soil moisture without surface runoff following non-rainy days (Wm). It is also found that the water level rises at an average rate of 5.3 mm per day during 6 days after the rainfall events. Therefore, based on the speculated subsurface runoff volume from previous soil moisture, Rb is 5.3 mm, WLm is 31.8 mm (5.3 × 6) and WUm is 58.6 mm (90.4 − 31.8). After choosing the closest meteorological stations in the China Daily Ground Climate Dataset (http://data.cma.cn/), E is regarded as 4.2 mm by averaging the evaporation consumption on non-rainy days from June to September between 2006 and 2012. Thus, regardless of how much it rains, the remaining soil moisture in the upper layer gradually evaporates over the next 14 days (58.6/4.2), and N is finally obtained. Combined with the basic information of the Hengshan Reservoir, the values of the model parameters are shown in the last column of Table 2.

Table 3

Typical rainfall events for model parameter acquisition

Date of rainfall processTotal rainfall amount (mm)Estimated surface runoff volume (mm)Number of non-rainy days beforeNumber of non-rainy days after
2006.08.08–2006.08.11 105.2 1.3 11 10 
2006.09.09–2006.09.15 102.1 2.1 12 27 
2007.07.07–2007.07.16 93.2 3.3 17 
2009.07.05–2009.07.09 91.2 0.0 13 
2011.07.10 81.1 1.0 18 15 
2011.09.05–2011.09.09 101.3 1.6 14 10 
2012.03.18–2012.03.22 81.0 0.2 13 26 
2013.07.4 74.4 1.4 11 
2014.08.26–2014.08.28 83.7 1.7 15 13 
Date of rainfall processTotal rainfall amount (mm)Estimated surface runoff volume (mm)Number of non-rainy days beforeNumber of non-rainy days after
2006.08.08–2006.08.11 105.2 1.3 11 10 
2006.09.09–2006.09.15 102.1 2.1 12 27 
2007.07.07–2007.07.16 93.2 3.3 17 
2009.07.05–2009.07.09 91.2 0.0 13 
2011.07.10 81.1 1.0 18 15 
2011.09.05–2011.09.09 101.3 1.6 14 10 
2012.03.18–2012.03.22 81.0 0.2 13 26 
2013.07.4 74.4 1.4 11 
2014.08.26–2014.08.28 83.7 1.7 15 13 

Close Modal

or Create an Account

Close Modal
Close Modal