Drawin in Tex

draw.tex

\usepackage{tikz}
\usepackage{verbatim}
\usetikzlibrary{arrows,shapes}
\usepackage{pgfplots}
\pgfplotsset{compat=1.3}
\usepackage{amsmath}

\usetikzlibrary{chains,positioning}
...

%%fig 1
\begin{tikzpicture}[scale = 0.7]
   % Draw medias
   \fill[blue!10]   (0,6) rectangle (10,8);
   \fill[blue!40]  (0,4) rectangle (10,6);
   \draw[dashed,line width=1pt] (0,4)--(10,4);
   \fill[blue!40]  (0,1) rectangle (10,4);
   \fill[brown!100] (0,0) rectangle (10,1);

   %draw media labels
   \draw(5,0)node[above]{Soil};
   \draw(5,2)node[above]{River};
   \draw(5,6)node[above]{Air};

   %exchange fluxes
   \draw(4, 1) node [above left]{$F_{2,b}$};
   \draw[<->,line width=1pt] (4,0.5)--(4,1.5);         

   \draw(4, 4) node [above left]{$F_{1,2}$};
   \draw[<->,line width=1pt] (4,3.5)--(4,4.5);

   \draw(4, 6) node [above left]{$F_{a,1}$};
   \draw[<->,line width=1pt] (4,5.5)--(4,6.5);

   %draw state variables
   \draw(7, 5) node {$h_1, T_1$};
   \draw(7, 2.5) node {$h_2, T_2$};


   %draw radiation flux
   \draw(8, 7) node [above left]{$LW + SW$};
   \draw[->,line width=1pt] (8,7.5)--(8,6.5);

   %draw precipitation flux
   \draw(9, 7) node [above left]{$P$};
   \draw[->,line width=1pt] (9,7.5)--(9,6.5);

   %runoff
   \draw(0, 6) node [above right]{$I$};
   \draw[->,line width=1pt] (0,6)--(1,6);

   %inflow
   \draw(0, 5) node [above right]{$Q^{in}_{1}$};
   \draw[->,line width=1pt] (0,5)--(1,5);

   \draw(0, 2.5) node [above right]{$Q^{in}_{2}$};
   \draw[->,line width=1pt] (0,2.5)--(1,2.5);

   %outflow
   \draw(10, 5) node [above left]{$Q^{out}_{1}$};
   \draw[->,line width=1pt] (9,5)--(10,5);

   \draw(10, 2.5) node [above left]{$Q^{out}_{2}$};
   \draw[->,line width=1pt] (9,2.5)--(10,2.5);
\end{tikzpicture}

%%fig 2
\begin{tikzpicture}[scale = 0.6]
 \begin{axis}[ xlabel = $h$, ylabel=$T$, xticklabels={,,}, yticklabels={,,}] 
   \addplot[color=black,line width=2pt] coordinates{ (-1,-1) (-0.5, 0) (0,0) (1,1)}; 
   \addplot[dashed] coordinates{(-0.5,-1) (-0.5, 0)}; 
   \addplot[dashed] coordinates{(0,-1) (0, 0)}; 
   \addplot[dashed] coordinates{(-0.9,0) (1, 0)};
   \node at (axis cs:-1,0){$0 ^\circ C $};
   \node[coordinate,pin=above:{$h=-L_{i,w} m_{total}$}] at (axis cs:-0.5,0) {};
   \node[coordinate,pin=below right:{$h=0$}] at (axis cs:0,0) {};
   %\node at (axis cs:-0.5,-1){$(-L_{i\rightarrow w} m_{total})$};
 \end{axis} 
\end{tikzpicture}