feat(CellBudgetFile): support aux vars in get_ts() method

autotest/test_cellbudgetfile.py

@@ -656,3 +656,105 @@ def test_read_mf6_budgetfile(example_data_path):
     assert len(rch_zone_1) == 120 * 3 + 1
     assert len(rch_zone_2) == 120 * 3 + 1
     assert len(rch_zone_3) == 120 * 3 + 1
+
+
+def test_cellbudgetfile_get_ts_auxiliary_variables(example_data_path):
+    from flopy.discretization import StructuredGrid
+
+    mf2005_model_path = example_data_path / "mf2005_test"
+    cbc_fname = mf2005_model_path / "test1tr.gitcbc"
+
+    # modelgrid for test1tr (1 layer, 15 rows, 10 cols)
+    modelgrid = StructuredGrid(nrow=15, ncol=10, nlay=1)
+
+    with CellBudgetFile(cbc_fname, modelgrid=modelgrid) as v:
+        node = 54 - 1
+        k = node // (15 * 10)
+        i = (node % (15 * 10)) // 10
+        j = node % 10
+
+        ts_default = v.get_ts(idx=(k, i, j), text="WELLS")
+        ts_q_explicit = v.get_ts(idx=(k, i, j), text="WELLS", variable="q")
+        assert ts_default.shape[1] == 2  # time + 1 data column
+        np.testing.assert_array_equal(ts_default, ts_q_explicit)
+
+        ts_iface = v.get_ts(idx=(k, i, j), text="WELLS", variable="IFACE")
+        assert ts_iface.shape[1] == 2  # time + 1 data column
+        assert not np.array_equal(ts_default[:, 1], ts_iface[:, 1])
+        np.testing.assert_array_equal(ts_default[:, 0], ts_iface[:, 0])
+
+
+@pytest.mark.requires_exe("mf6")
+def test_cellbudgetfile_get_ts_spdis_auxiliary_variables(function_tmpdir):
+    from flopy.mf6 import (
+        MFSimulation,
+        ModflowGwf,
+        ModflowGwfchd,
+        ModflowGwfdis,
+        ModflowGwfic,
+        ModflowGwfnpf,
+        ModflowGwfoc,
+        ModflowIms,
+        ModflowTdis,
+    )
+
+    sim_name = "spdis_test"
+    sim = MFSimulation(sim_name=sim_name, sim_ws=function_tmpdir, exe_name="mf6")
+    tdis = ModflowTdis(sim, nper=2, perioddata=[(1.0, 1, 1.0), (1.0, 1, 1.0)])
+    ims = ModflowIms(sim)
+    gwf = ModflowGwf(sim, modelname=sim_name, save_flows=True)
+    nrow, ncol, nlay = 5, 5, 1
+    dis = ModflowGwfdis(
+        gwf,
+        nrow=nrow,
+        ncol=ncol,
+        nlay=nlay,
+        delr=10.0,
+        delc=10.0,
+        top=10.0,
+        botm=[0.0],
+    )
+    ic = ModflowGwfic(gwf, strt=5.0)
+    npf = ModflowGwfnpf(gwf, k=1.0, save_specific_discharge=True)
+    chd_spd = [[(0, 0, 0), 10.0], [(0, 4, 4), 0.0]]
+    chd = ModflowGwfchd(gwf, stress_period_data=chd_spd)
+    budget_file = f"{sim_name}.cbc"
+    head_file = f"{sim_name}.hds"
+    oc = ModflowGwfoc(
+        gwf,
+        budget_filerecord=budget_file,
+        head_filerecord=head_file,
+        saverecord=[("HEAD", "ALL"), ("BUDGET", "ALL")],
+    )
+
+    sim.write_simulation()
+    success, _ = sim.run_simulation(silent=True)
+
+    cbc_file = function_tmpdir / budget_file
+    with CellBudgetFile(cbc_file, modelgrid=gwf.modelgrid) as cbc:
+        spdis_data = cbc.get_data(text="DATA-SPDIS")
+        if len(spdis_data) == 0:
+            pytest.skip("No DATA-SPDIS records found")
+
+        available_fields = list(spdis_data[0].dtype.names)
+        expected_fields = ["node", "q", "qx", "qy", "qz"]
+
+        for field in ["qx", "qy", "qz"]:
+            assert field in available_fields, (
+                f"Expected field '{field}' not found in {available_fields}"
+            )
+
+        test_cell = (0, 2, 2)
+        ts_q = cbc.get_ts(idx=test_cell, text="DATA-SPDIS", variable="q")
+        ts_qx = cbc.get_ts(idx=test_cell, text="DATA-SPDIS", variable="qx")
+        ts_qy = cbc.get_ts(idx=test_cell, text="DATA-SPDIS", variable="qy")
+        ts_qz = cbc.get_ts(idx=test_cell, text="DATA-SPDIS", variable="qz")
+
+        assert ts_q.shape[1] == 2  # time + 1 data column
+        assert ts_qx.shape[1] == 2
+        assert ts_qy.shape[1] == 2
+        assert ts_qz.shape[1] == 2
+
+        np.testing.assert_array_equal(ts_q[:, 0], ts_qx[:, 0])
+        np.testing.assert_array_equal(ts_q[:, 0], ts_qy[:, 0])
+        np.testing.assert_array_equal(ts_q[:, 0], ts_qz[:, 0])

flopy/utils/binaryfile/__init__.py

@@ -1604,7 +1604,7 @@ def get_data(
             if t
         ]
 
-    def get_ts(self, idx, text=None, times=None):
+    def get_ts(self, idx, text=None, times=None, variable="q"):
         """
         Get a time series from the binary budget file.
 
@@ -1619,6 +1619,11 @@ def get_ts(self, idx, text=None, times=None):
             'RIVER LEAKAGE', 'STORAGE', 'FLOW RIGHT FACE', etc.
         times : iterable of floats
             List of times to from which to get time series.
+        variable : str, optional
+            Variable name to extract from the budget record. Default is 'q'.
+            For records with auxiliary variables (e.g., 'DATA-SPDIS', 'DATA-SAT'),
+            this can be used to access auxiliary data. Examples include 'qx',
+            'qy', 'qz' for specific discharge components.
 
         Returns
         -------
@@ -1638,6 +1643,9 @@ def get_ts(self, idx, text=None, times=None):
         Examples
         --------
 
+        >>> # Get specific discharge x-component from DATA-SPDIS record
+        >>> ts = cbb.get_ts(idx=(0, 5, 5), text='DATA-SPDIS', variable='qx')
+
         """
         # issue exception if text not provided
         if text is None:
@@ -1669,45 +1677,61 @@ def get_ts(self, idx, text=None, times=None):
         for idx, t in enumerate(timesint):
             result[idx, 0] = t
 
+        full3d = True
         for itim, k in enumerate(kstpkper):
-            try:
-                v = self.get_data(kstpkper=k, text=text, full3D=True)
-                # skip missing data - required for storage
-                if len(v) > 0:
+            if full3d:
+                try:
+                    v = self.get_data(kstpkper=k, text=text, full3D=True)
+
+                    # skip missing data - required for storage
+                    if len(v) == 0:
+                        continue
+
                     v = v[0]
                     istat = 1
                     for k, i, j in kijlist:
                         result[itim, istat] = v[k, i, j].copy()
                         istat += 1
-            except ValueError:
+                    continue
+                except ValueError:
+                    full3d = False
+            if not full3d:
                 v = self.get_data(kstpkper=k, text=text)
+
                 # skip missing data - required for storage
-                if len(v) > 0:
-                    if self.modelgrid is None:
-                        s = (
-                            "A modelgrid instance must be provided during "
-                            "instantiation to get IMETH=6 timeseries data"
+                if len(v) == 0:
+                    continue
+
+                if self.modelgrid is None:
+                    s = (
+                        "A modelgrid instance must be provided during "
+                        "instantiation to get IMETH=6 timeseries data"
+                    )
+                    raise ValueError(s)
+
+                if self.modelgrid.grid_type == "structured":
+                    ndx = [
+                        lrc[0] * (self.modelgrid.nrow * self.modelgrid.ncol)
+                        + lrc[1] * self.modelgrid.ncol
+                        + (lrc[2] + 1)
+                        for lrc in kijlist
+                    ]
+                else:
+                    ndx = [
+                        lrc[0] * self.modelgrid.ncpl + (lrc[-1] + 1) for lrc in kijlist
+                    ]
+
+                for vv in v:
+                    available = vv.dtype.names
+                    if variable not in available:
+                        raise ValueError(
+                            f"Variable '{variable}' not found in budget record. "
+                            f"Available variables: {list(available)}"
                         )
-                        raise AssertionError(s)
-
-                    if self.modelgrid.grid_type == "structured":
-                        ndx = [
-                            lrc[0] * (self.modelgrid.nrow * self.modelgrid.ncol)
-                            + lrc[1] * self.modelgrid.ncol
-                            + (lrc[2] + 1)
-                            for lrc in kijlist
-                        ]
-                    else:
-                        ndx = [
-                            lrc[0] * self.modelgrid.ncpl + (lrc[-1] + 1)
-                            for lrc in kijlist
-                        ]
-
-                    for vv in v:
-                        field = vv.dtype.names[2]
-                        dix = np.asarray(np.isin(vv["node"], ndx)).nonzero()[0]
-                        if len(dix) > 0:
-                            result[itim, 1:] = vv[field][dix]
+
+                    dix = np.asarray(np.isin(vv["node"], ndx)).nonzero()[0]
+                    if len(dix) > 0:
+                        result[itim, 1:] = vv[variable][dix]
 
         return result