Hydrologic simulation models generally are designed to transform input rainfall into a hydrograph for a particular watershed. Many models are designed to do this for single storm events. Continuous simulation models are designed to transform rainfall data for a long period of time (a year of severa[……]
“The Log wind profile is a semi-empirical relationship commonly used to describe the vertical distribution of horizontal mean wind speeds within the lowest portion of the planetary boundary layer. The relationship is well described in the literature”. “The logarithmic profile of wind speeds is g[……]
Before understanding the difference between hydrologic and hydraulic modelling, it is essential to have an understanding of the differences between hydrology and hydraulics.
“Hydrology is the scientific study of the movement, distribution, and quality of water on Earth and other planets, including[……]
Evaporation is the transferral of liquid water into a gaseous state and its diffusion into the atmosphere. In order for this to occur there must be liquid water present and available energy from the sun or atmosphere. Potential evaporation (PE) is that which occurs over the land’s surface, or woul[……]
According to the definition of Wikipedia, goundwater (or ground water) is the water present beneath Earth‘s surface in soil pore spaces and in the fractures of rock formations.Indeed, all water beneath the surface is ground water, but it is convenient to distinguish between the saturated and unsatur[……]
1. The future in rainfall-runoff modeling is therefore one of uncertainty, but this then implies a future question as to how best to constrain that uncertainty.
2. There have certainly been important and interesting advances in rainfall-runoff modeling techniques, but we are still very de[……]
There are NAN values in the output of the output.rch, ouptput.std. I checked the results and found that the PET in November 2021 are NaN values. So, I checked the tmpa.tmp file. I have taken many hours to ensure that the file in the corresponding month (2021) is right. But,all effort just in vain.[……]
How to convert the xls files to dbf files to make them can be used as the SWAT input
Ling ZHANG 2015/3/26
1. Because the Field of the date can’t be named as DATE (Arcgis reserved characters). Thus, we must use the existed file. But if the rows of our data is longer than the existed file, how[……]